As I mentioned in my last post, it has been revealed that Jon Snow, Daenerys Targaryen, their unborn children, and remaining two dragons will survive in the end. In the plot leak I mentioned in my last post, Daenerys will give birth to twins, one who is a boy who inherited Jon Snow’s Stark features of black hair and grey eyes and a girl who inherited Daenerys’s Targaryen features of white hair and purple eyes. Due to this, I think all modern Targaryens will either have black hair and grey eyes or white hair and purple eyes, but they would always have the long face of the Starks. It is unknown if Daenerys and Jon will have more than two children, but if so then that would serve House Targaryen even better. Drogon and Rhaegal will probably start roosting on Dragonstone and lay a clutch of eggs, which would be available to future generations of Targaryens. Dragonstone is easily the best place to breed and house dragons in all of Westeros, even more so than the Dragonpit, and has been for three hundred years.
With the Seven Kingdoms independent and the Iron Throne destroyed, Jon and Daenerys will likely rule the Crownlands and abandon King’s Landing, replacing it with Dragonstone as their seat. With no Iron Throne, King’s Landing would be reduced from the capital of an empire to the largest and wealthiest trade center in Westeros, which would serve as the bulk of the modern Targaryens’ wealth. Jon and Daenerys will probably give King’s Landing to their most loyal supporter in the Crownlands, whoever that is. The fertile farmlands of Crownlands would also serve as the kingdom’s main source of food alongside trade with both the rest of Westeros and the Free Cities of Essos. The Kingswood would remain the Targaryens’ private hunting ground. Tournaments and other festivities would be held right outside the gates of King’s Landing.
In terms of military, it has been stated in a semi-canon source that the full military strength of the Crownlands would be between ten to eighteen thousand strong while its navy was over two hundred ships. Once Westeros has stabilized, I can imagine that these numbers will remain the same after a few generations of healing. It may be small compared to the rest of the Seven Kingdoms, but its strength would be explosively augmented by dragons. If a rebellion breaks out, it can be swiftly ended with just a dragon or two. Dragonstone by itself can hold a garrison of around five hundred men, which is increased to around three thousand when combined with the other islands in Blackwater Bay.
With Houses Frey and Tully all but extinct and the Riverlands practically leaderless, I wonder if Jon and Daenerys would negotiate the annexation of the Riverlands to the modern Crownlands. This would more than double their military strength, increase their wealth, and boost production of food. The Riverlands had been fought over and conquered countless times since the Dawn Age, but Jon and Daenerys would be the first to peacefully gain the Riverlands through negotiation instead of war. In total, this modern Crownlands will grow into a kingdom that stretches from the western coast of the Riverlands to Dragonstone. It would be a kingdom that would be roughly the same size as the Reach and a third of the size of the North. It would be a worthy inheritance for Jon and Daenerys to pass onto their children and descendants.
As the actual head of House Targaryen, I can imagine Jon Snow bringing a Stark-like flare to Dragonstone. It is a nice thought if Dragonstone becomes as peaceful and lively as Winterfell was before the War of the Five Kings. While Daenerys would teach their children dragonriding and when to ruthless, Jon would teach them Stark honor such as “the man who passes the sentence must swing the sword.” Longclaw would replace Blackfyre and Dark Sister as the new Valyrian steel sword of House Targaryen and Jon would probably hang it above the mantle in the Chamber of the Painted Table. Also, I can see Jon salvaging a weirwood tree from the Winterfell godswood and planting it on a hill on Dragonstone, which would be where future generations of Targaryens would execute condemned criminals, have weddings, and worship the Old Gods of the Forest like the Starks before them.
In terms of politics, I can imagine Jon and Daenerys marrying their son and daughter to two of their Crownland vassals, Houses Velaryon and Celtigar. Like the Targaryens, the Velaryons and Celtigars are of Valyrian descent and they intermarried one another multiple times to keep their Valyrian blood pure. Marrying their son and daughter to each of these Houses would not only ensure the purity of the blood of the dragon, but it will allow them to reconnect with their old vassals and cousins. After this, the incestuous practices of House Targaryen will be brought to a permanent end. Over time, they would probably marry their descendants off to the other noble Houses across the Crownlands/Riverlands in order to consolidate their hold on the kingdom. In two or three generations, the Crownlands/Riverlands will be firmly in House Targaryens’ hands. Once their hold on the modern Crownlands is complete, future generations of Targaryens would improve foreign relations with the other sovereign kingdoms by marrying into other royal families. This would further guarantee the duration of the peace that untold thousands (or even millions) died for.
In the past, Targaryen kings were titled “King of the Andals, the Rhoynar, and the First Men, Lord of the Seven Kingdoms, and Protector of the Realm”. However, those titles were only relevant as long as the Iron Throne existed and the Seven Kingdoms were united under a single banner. With the Seven Kingdoms independent from one another, the modern Targaryens would adopt new titles to suit their new position. I can imagine them styling themselves as “Lords of Dragonstone and Kings of the Blackwater and the Trident”. The heir apparent to their throne would retain their title “Prince or Princess of Dragonstone”.
Overall, I think the Crownlands/Riverlands will be an adequate amount of land for Jon and Daenerys to manage after Season 8 and it should be safe in their hands.