Why...? What do you mean some things "don't really work"?
Why would they change anything like this to begin with?
I'm not talking about me, because it'd totally work for me (IX is my favourite game ever, and that one was full of comedy).
But I can see some people (the developers included) thinking that stuff like that, the slap minigame, the Honey Bee Inn... would look awkard with the realistic style they're supposedly pursuing. I was also talking about certain gameplay mechanics that would need a complete overhaul or some modification (don't ask specifics, it's been about 4 years since I last played VII, sorry xD). But some frustrating elements (like minigames) could totally be removed or changed (for the better, hopefully), since this is a game from 1997 that let's say... didn't have the best 3D mechanics (understandable).
Again, that's not my thinking, but I could see that happening with certain things (especially since this is a reimagination and not a word-by-word remake). More realism means that certain cartoony/animey elements would look weird for some people, while they didn't stand out with VII's fixed cameras and already weird models. However, I don't think they'll break the great comedy/tragedy balance the original had after reading Nomura's comments. I hated AC (I think I've said this about 100 times by now lol), but that was (if we trust his words and notice his other work and this trailer) something different, deliberately created that way, to contrast VII's ending. So I think they'll keep the essence and most elements will remain.
And this is (somewhat) unrelated, but man, I loved if they followed a slighty cartoony style to match this:
Maybe because I've always disliked their CG models, too doll-like for me. But again, XV looks great in that regard and, even if using different engines, the artstyle is probably going to be similar. And if there's something we can get out of the teaser, is the AMAZING atmosphere it has. And Cloud, even if we only see his back, has his classic design (pre-Compilation Buster Sword included!). So the art department is the last thing I'd have to worry about.
BTW, I know I'm complaining a lot without even seeing a single screenshot lol. But I love debating about this stuff and whatever comes, I'll be excited to see it unfold. I'm also slowly warming up to a completely different battle system, even if I still prefer they did a big change/improvemente to the original ATB. So long as they let us control the whole party (which I don't see why it wouldn't happen).