I say it's Nostalgia. Don't forget about the hardware we had to play for the past games (Gamboy/Gamboy colour for Red/Blue). They are mostly trying to bring out the hardware capability to the max. I also agree that the designs had always been a mix bag of good and bad but I always welcome the new ones with open arms. At the end of the day if you don't like the game then just trade it in and I guessing some people won't be buying the possisble next Pokemon game if there will be one (it most likely be a new one).