Yeah, I don't see their gym type, nor their key Pokemon, changing.
I don't really like that trainer customisation isn't coming back nor agree that 'because we want to focus more on adventure [with remakes]' is a satisfactory reason. As said above - why not both? It's not like the ability to change clothes means you're ignoring all the adventure that comes from climbing volcanos, diving underwater, fighting giant weather gods, beating up small children with fire-breathing creatures, etc.
But it's kinda typical of Game Freak to throw in a feature that people generally like and then remove it from the next game. =p Oh well.
The fanbase was arguing with itself about all sorts of things before RSE, I assure you. =p