but look where we are now with that
Cell (which is PowerPC64) has several significant components which are going to be absolutely murder to effectively run on any standard PC configuration; the main processing unit which controls the rest of the pieces, 6 functional cores for games and a data bus which controls input/output, and that's not focusing on any of the rest of the PS3's hardware.
Cell is used in scientific laboratories and high performance media equipment. The PS3's incarnation might not be the strongest variant, but current PC hardware is far away from running most of the games in an emulated state.