No. they are the main antagonist of skyrim, the future games in serie will most probably come up with new fresh ideas
So.. what? Bethesda is just going to hand wave them away? I certainly hope not. Dragons are awesome, and I want them interacting with Argonians (in a positive manner of course).
If dragons were to be permanent then your character would need to be dragon born and I don't see that happening. The next ES might be a completely different era
What? Your character doesn't have to be Dragonborn for there to be Dragons around. There was a Dragon who was a Mercenary/Bodyguard in the game "Redguard", and you weren't dragonborn there.
Dragons being apart of Tamriel =/= Fighting Dragons all the time/