>> A RISC-V server or desktop processor would have to be created essentially from scratch.
I'd love to see AMD or Intel build a chip on the RISC-V instruction set and use all their existing infrastructure around that. I would not be surprised it they could achieve higher benchmark performance than their x86 offerings. For someone else to achieve the same level of performance will take a while, but there are multiple groups working on it.
A RISC-V server or desktop processor would have to be created essentially from scratch.