The PS3 had the CELL architecture which dealt with computations differently then most processors and architectures. It would take a lot of time and resources to properly try to emulate the cell architecture on X86, and that's not even taking into account the various methods most developers had to take to get their games running on the CELL. So Sony probably doesn't see it as a fruitful endeavor, especially since they have PlayStation NOW.
Cell is a chip, not so much an architecture. If we're talking about compatibility and the PC4 moving to X86, the more relevant thing to bring up is that cell was based on PowerPC architecture (i.e. what old Apple computers used to use). Which is why when Apple moved to X86/Intel they had to specifically write Rosetta to get old Mac software to work.