I'd only support open-only powerplay if they also completely removed it from any real effects in the game, including both story-related stuff (so it wouldn't be allowed to be associated with galactic powers any more as they are story-related) as well as mechanical things (like affecting BGS and module prices as well as giving perks and modules to those that participate in it). As long as it remains completely divorced from being able to affect those that don't play open, whether in absolute or relative terms, then I'm okay with it going open-only.
Player driven Powerplay has never (bar one Utopian Galnet story right at the start that was directly talking about an expansion) ever changed the ED 'story'. FD got burnt with that story I mentioned as it confused the playerbase, so they never did it again.
As long as it remains completely divorced from being able to affect those that don't play open, whether in absolute or relative terms, then I'm okay with it going open-only.
If you don't play Powerplay at all, what difference does it make what mode its played in? The effects are still the same.
With that in mind, rather than stripping powerplay out from all the other systems and lore it is connected to (causing a bucket load of missing gameplay and development opportunities)
Other than the leaders themselves, Powers do not have lore that pins them to the rest of the game.
...it would make more sense to simply make a copy+paste of powerplay then strip that out of the entangling related systems and rename it to something like "shadow conflict" to represent the powers using privateers against each other rather than the normal powerplay's enlisted agents; creating an open-only clone of powerplay lets adversarial players have their game of massively-multiplayer risk without affecting the rest of the galaxy,
So CQC Max. Unless FD want to pay for extra servers, I can't exactly see them go for that. I do like the idea of having a split with the open aspects for some areas, with underpinning logistics for solo and PG. But again, unless its super simple to do, FD won't do it.