We need faster single cores more than we do more cores these days as so few apps can efficiently use more cores.
can't push them much higher as the laws of physics are preventing anything higher.
We have nearly reached the limit of si.
A new compound will have to be sought out the way I understand it.
Or design a totally new instruction set and method and retire x86. Or how about writing software to use more cores and stop depending on raw frequency. There's a start.