You've got a few walls to consider:
- 1) the R&D for new high performance chips is about to flat line. Intel's latest 10 core chip pushes its 14nm process to the limit, but pushes 200w at load. That's not counting the 3D burden... the meaning of Intel (everyone, in fact) hitting this wall is that for every further increase in performance, the returns will diminish. This i7 6950 is likely to be the highest speed consumer chip either Intel or AMD ever produce. Also, clockspeed becomes a factor when emulating a complex system like the PS3. The clockspeed of the PS3 is already so high that one core is unlikely to be able to cope with the task of managing a single PS3 core. Inter-core cooperation is actually quite limited... multi-threading requires divvying up tasks, not sharing them.
Apparently small fry games like say, Scott Pilgrim can be emulated at full speed with modern systems. But the really impressive games? Don't hold your breath for them.