If Dany dies, then in my opinion there's not going to be a queen in the show version. Jon will be King with no Queen. Perhaps in the books George will have Jon marry Sansa or Arya but they won't do that in the show because of strange it is and would be to the viewer. Instead it would likely be written as the two of them being power brokers who assist Jon govern. Hence Arya's show only conversation with Tywin where she reminds him "It was Aegon and his sisters." Not just Aegon.

That was show only. They didn't have to do that scene, but chose to. And since they likely knew his name was Aegon at the time of writing that scene, I wouldn't dismiss that as nothing.

But this is all based around the idea of what may happen if Dany dies. If she doesn't die than none of this matters.