If AMP not handed over to the W3C, I don't think we can or should call it a standard.
I don't think Mozilla was super fond of EME either, but couldn't afford to be "the web browser that can't watch Netflix".
I definitely do remain wary of these groups being forced to rubber stamp things, I do feel Google exerts way too much control even in that space, because due to their monopolies, they can just implement what they want, and sometimes the W3C has to accept it or be irrelevant.
The whole point is that AMP works on all major browsers as they exist today. Waiting for a new standard and then waiting for Apple to implement it is a non-starter.
Google's always only supporting competing software just as much as absolutely necessary
On the other hand, using the web package standard as the ancestor suggests would currently trap you to Google.