But there are many people who stay because they're seeking to be PUA wingmen/coaches (either amateur or paid-for), or simply to improve their outcomes and their understanding of seduction- and social dynamics.

Good point.

The flip side of it though is that if the 'heavyweight' political folks are right about what they infer from PUA micro dynamics (I'm far from convinced about this, but we can assume it for the sake of this argument) there might not even be much need for further work on the micro side.

I don't see the connection. Even if the coordination system of society is falling apart, that doesn't mean that men can't enjoy the fruits of PUA ability in the short term. Why would Roissy Macro being correct not leave room for further refinement in the practical art of seduction?