Even that will take a lot of effort and money, but being Qualcomm and Google I'm sure they'll pull it off. I'm not sure however how open will these RISC-V processors be, given that Qualcomm could just put their own custom extensions and make them proprietary.
Yeah, I don't think a lot of people understand that RISC-V doesn't mean every RISC-V SoC is open. It's only the underlying architecture that's actually open.