Aren't most sports games and fps genre games just yearly remakes? Sometimes not even a remakes as they are in the same engine.
The buying public has dictated that we will buy rehash after rehash, so why wouldn't they continue to knock them out for a quick buck?
This isn't a new thing though, how many remakes of pacman, frogger, space invaders, etc, etc have been released as the systems got better. The only way it will stop is if the buying public speak with their wallets.