The poster asks a question that assumes breakthroughs can be planned just like any other development project. But breakthroughs are not, or rather, those that can be planned and worked already have been. The computer science field has been operating awash with funding for at least 55 years.
I'm not saying there are no breathoughts out there, what I'm saying is that our current project methodology has already discovered all it can, and most future breathoughs will come from some other methodology.
The target, CPU/GPU power is also not especially compelling -- compared to the past, there is much less pressure to increase performance, and considerable uncertainty how the increase will be helpful.