IDK about Cortex M being soon overtaken by RISCV.

There is a huge discussion about peripherals and IP. You can buy peripherals for ARM all day long, they’ll work from one chip to another for the most part. Once everyone can “make their own CPU”, expect fragmentation in the peripheral interfaces.

I think low end cortex A and R are where V will shine first. Something like a CISCO IP phone, not an iPhone.