I must say, I’m very pleased by your answers 
And I hope you are able to get your RYF answers that way by directely contacting both sides
Like you, I have a old CPU for my main computer (6cores, 2,8Ghz, 125W TDP)
But in speed comparaison with a much recent CPU (4 cores, 1.9Ghz, 25W TDP) on an other computer, my old one get completely crushed by it
There is more than Cores and Ghz to obtain a better speed (and less power consumption)
What we can hope is that they can bring in futur what you expect, but it is far from an easy way for a small company (the only one doing something like that ?)
I guess they could do some bottom range laptop with the 4256 EE (2011 CPU without PSP, 8cores, 1.6Ghz, 35WTDP), it could be nice ! But I guess the problem facing here is the production of the CPU.
I really not sure that a powerPC CPU is realistic here (even Apple 50% owner abandoned it for Intel because of performances)
I totally agree with you here, but again those are old and probably not produced anymore