If you do a google search on "ps3 play copies" or something similar you'll find websites and forum posts indicating that this has already begun and that people are toying with the possibility of running even windows games on it, if you look further through the search results you'll probably find a video of a hacker that practically tore his PS3 apart so he can play back-up copies of PS2 games on it (video is also available on youtube.com)