The Future of The RPG

It has come to my attention that after playing the new Final Fantasy XIII game, every new RPG seems to have to HAVE a new battle system. Not really sure why this is. I find that this is just an extension of previous rpg games that have been released previously, and is usually a change that is not for the better. As new rpg games come out their menu's and battle systems seem to get more convoluted, clumsy, and clunky. This inevitably leads to gamer confusion and disinterest in determining the end of the story.