tbh I don't think they need to do major changes nor do I think they will, but it'll probably be small changesin a format without the like insane powerful megas from XY/ORAS, Mega Emboar is probably alright. Mold Breaker on a fire type can be useful sometimes. Really depends on what its movepool ends up being. Maybe Mold Breaker gets a buff in mechanics, maybe its like uniquely positioned to counter some new pokemon in gen 10, impossible to say really.
as far as the balance changes goes, I really think people are expecting a lot more than they will actually do. not impossible they'd do it but replacing abilities is pretty rare and most buffs they did in the past were movepool based. whenever they buffed stats it was very rare for them to do it by more than like 10.
I think they were going to expand on single player content regardless, as they have been doing, and I'm not sure why people continue to imply that can only be done with changing the battle system. This sort of thing comes up before every new generation, and it's very hard to read it as more than just motivated reasoning.
I have one thought which is the idea of maybe they'll have different "repeat" versions of a mon slightly tweaked for different metas.
They likely got rid of Encore on Gengar due to Megs Gengar Shadow Tag, for instance. Maybe if they do a format without Megas they give Gengar back, and maybe with this they could streamline with known "variants" where a mon with different gimmicks enabled has some movepool changes.
One thing I hope they change is Protean, the nerf due to Tera makes me sad, let us see Meowscarada at peak potential like Cinderace and Greninja, please.


