Hmm, difficult. I think, after Apple jumped ship in 2006 no commercial company sees a market in new desktop/ mobile PowerPC chips. To build a POWER derivate chip, you need a lot of experience. Even IBM sees no one able to do such a development.
It's also a question of ROI (return on investment). You need a lot of money and a long breathing. As long as we don't have a lender of capital (such as e. g. BlackRock

) we can put that idea right out of our mind

BUT, I love your idea anyway, no question about that

Would be cool to see IBM doing this, pulling a hat (chip) overnight with twice the performance and half power consumption in comparison of Intels best offerings, like in 1997
