I loved it as a final programme, I hated it as an ending (especially for JS). I realised in the middle of the night that of course it's because it's not an ending. Life goes on in Westeros. We may have stopped getting news from the ravens, but that doesn't mean things have come to an end. And we were shown that yesterday: Sam presented Tyrion with the completed ASOIAF.
Things in KL won't be easy for them at first. The survivors of the north won't be happy to bury the dead, they'll insist on them being burnt, which will upset the living of KL, who will see it as the final insult.
The Iron Islands and Dorne won't be happy to remain one of the six when the North is free, especially if heavy taxes are introduced to pay for the rebuilding of KL. I suspect Yara could bring her army down again, after a bit of R+R, but hopefully she'll keep her head and do things peacefully. After they've split the remaining three will fall apart.
What did Tyrion say was the most powerful weapon? Stories. And what was he presented with? The story of the recent history, which at its heart has the story of R+L=JS. This story will get out. Tyrion will visit brothels and tell the whores, tell people in pubs, tell everyone. Very quickly JS will go from man to legend, and the common folk will make connections with Azor Ahai.
They will also hear about Sam's idea of democracy, and I think they'll grab the idea and run with it. There will be calls to bring JS back, to guide the independent kingdoms. Arya will go north of the wall to find him, and will also find Nymeria. In the meantime JS has found the Children of the Forest and improved relations with them.
Bran will stand down as king - he's only there as an interim leader. The council will continue, as that's where the true power is, but members will be voted on to it.
There will be trouble brewing across the Narrow Sea - Greyworm hears of JS return and isn't happy, and the kingdoms pull together to see off this latest attempt at invasion.
I'd love for the ravens to return in ten years and update us all.