Not really... they're at opposite ends of their life cycles. POWER is a dying, dead-end[1] architecture while RISC-V is just getting started. Open sourcing something already in steep decline won't typically bring it back unless there are no other options.
[1] The only people who have any incentive to invest in it going forward are those who already have significant investments in it.
There is no natural life cycle for an ISA. (I am looking at you, x86!)
It is easiest to pretend there is such a thing, because we are socially attuned for that. But it is not a technical observation, but a sociological one. And, that was my point.
We have maybe learned a few things about ISA design since POWER was cast. But we have also forgotten things. It is far from clear we are ahead. Most of what we learned feeds into stuff like vector units that have little to do with whatever they are bolted onto.
One example is the popcount instruction, omitted from the base RISC-V, and from all chips when last I checked. It has been added to every architecture ever mainstreamed, always at great expense, but it seems hard for ISA designers to contemplate. There is a special extension just for it so it could be put into a standard "profile" without importing the entire B thing.
True, from a technical standpoint. I was referring to the business standpoint as it seems like other than IBM, what businesses are still making any investments in it? (i.e. no consoles using it anymore, Apple is long gone, Motorola (spinoffs) appear to at best be phasing out etc)
[1] The only people who have any incentive to invest in it going forward are those who already have significant investments in it.