EDIT: I'll just clarify this because I think I worded my title poorly. I doubt there is a system that will be enjoyable for both sides. I meant by "fun for everyone" that it would cause the least amount of criticism from both sides.
Inspired by the comments of the somewhat obvious revelation that the battle system from FF7 will not be present in the remake, I decided to see if we could have a civil discussion on what the new battle system will either most likely be or how you envision it should be. Of course lets stay within the realm of reality here too.
At the same time perhaps you have an idea of how both people of traditional and newer RPGs could have a combat system that won't result in either side hating each other.
My opinion:
I believe they could modernize the battle system and improve it in several ways. For example I feel like switching between characters should be easy (were you set with what you had during battle, I forget ) but I also feel like the summons can be handled like in FFX where you bad full control over the animals you had (maybe for a limited amount of turns like in Dragon Quest 8?). Also the menu's magic list should be a be less bulky (some magic I wanted to use on enemies was at the bottom of the magic list and took forever to reach... I feel like there should be a way to organize that without having gaping holes where other magic the character lacks is).
However, since it'll probably run on the FF15 engine, I think combat will be similar to that except you'll be able to switch between characters (I think initially they thought about doing that in FF15 but took that out, can't find the source for that though XD).
But what are your thoughts? How should they handle it? How will they realistically deal with the battle system? Is there a way to combine turn based and action without it being like FF12 (liked the game but I feel it didn't have everyones fave system of combat)?