Ah, but look at Nintendo with the N64 and expansion pack. It was great if you had it but could still run the games regardless of wether you had it or not. So being able to pull something out of a console and put something new in could work.
Not forgetting if that route was taken due to parts being mass produced it would still work out cheaper in the long run than upgrading a PC every six months just to be able to play the latest games at reasonable resolution and framerate.