Assuming that Dany dies next week...
What do people predict becomes of Drogon?
1. That he, as it were, becomes Jon's.
2. That he just flies away, e.g., to hang out in Essos & maybe the ruins of Valyria in particular, or maybe the shadowlands.
3. That he goes berserk, laying waste to what remains of Westeros.
4. ????