I also don't want a different game, and I never said anything about endgame content... It could be something as silly as bringing back chocobo escorts! It's just something different.
Also, to use FFXI as an example, this is a game that changed its endgame every single expansion (dynamis, sea, sky, abyssea, on and on) and is still going (just about). So much variation in the types of PvE battle content available, whilst very much keeping the game itself the same game.