What will make me give up is if I don't enjoy DDD, BBS 2, and KH3 (the last one I've completed being Re:Coded). From what I've heard, these games aren't exactly amazing in the gameplay, with a lack of exploration and puzzle solving, and janky combat. I already know from looking at cutscenes that the writing is just horrendous with just about no redeeming values, but pretty much every KH game I've played is fun to play with great music, so I might like these games and not give up on the series.
I also really would not be keen on the series if it includes any Marvel content. It's not a hard pass, but if the series includes loads of it, I'll probably give up. If they keep all the Marvel stuff in one game only, that'll be fine because I can just skip that game.