Problem 1: Powerplay has is that it sits in the shadow of the BGS which has eaten its lunch- with the BGS you can go multi mode and play the entire game to further it, whereas with Powerplay you have two 'missions' that date from 2015- haul and shoot.
Problem 2: modes are imbalanced- NPCs do not provide a structured enemy action in solo or PG, leading to easy fortification in solo, PG AFK turretboats with heal beams breaking combat merits while open provides resistance. This leads onto...
Problem 3: Its far too easy to defend in Powerplay, its whats led to its current state because the bias is with easy fortification, consolidation and its hard to attack in a way thats congruent to the feature (i.e. not using weaponsied expansions, 5C etc which often flow from sock puppeted powers).
Problem 3a: the bubble is full because defence is too easy, leading to stagnation. Powers week in, week out go for consolidation leading to a boring game. You know its bad when one expansion attempt moves a power up 5 places and is the only expansion that week out of eleven powers. With a combat focus powers will always be vulnerable.
Problem 4: Powerplay is designed to be 1:1 action, and not abstracted. The BGS uses abstractions like the tick and actions form an aggregate of the days work. Powerplay is not desigfned this way- you have explict territory, pledges, near real time feed back all coming together so you can follow an action and see it appear on the UI 1:1. If you make Powerplay an abstraction like the BGS it becomes incredibly dull.
Problem 5: Powerplay is at its heart a CG for each of your control systems plus any expansions and prep sites. A median number is about 50. Compare ineffectual NPCs to effective commanders and you can see how easy one mode can support such sizes.
Problem 6: Powerplay is not about positive action. Its you and your power screwing over another in any way possible- its gang warfare.
You also forget teamwork and the tactics, new ship builds and skill that no other part of the game uses. People want structured PvP- give it to them. The PvP on offer in Powerplay would be much more complex and nuanced, all planned and player driven with actual objectives.
All Powers offer training, and its in their best interests to keep haulers alive because thats how the power survives.
Lastly, from what FD have said the only new gameplay on offer is Open. None of the other suggested tweaks gives anything, in fact the entire proposal revolves around it.
Going by the numbers of respondents in polls here and elsewhere, many more would come to Powerplay than leave it.