So I know on which side I am betting as winner for this chess game, given that Apple and Google seem to getting all the pieces with their moves.
These new APIs will either stand the test of time and become standards in their own right (POSIX, after all, is codifying existing practice from multiple vendors). Or they will die with the end of life of the products using them.
It's worth noting that POSIX is the fundamental basis of all these products. It's not perfect, and there's certainly room for new revisions or even a complete replacement in the longer term. But open standards are worth fighting for any using, given the alternatives. We got the current open standards through it becoming a requirement that vendors provided them and supported them, and that came from grassroots developers pushing for it. The current big players will eventually have to do the same, and we can all play our part pushing them to do so.
Not everyone wants to live in the past.
Stardards are only relevant as long as the industry cares to use them.