And that is where you go wrong.
Making PP OO doesn't change the mechanisms of PP. When the answer to people who ask: "Why should I play Poweplay in open is: 'because it is limited to open'", then that's a convoluted out of game reason. If the answer is: "Because PvP will grant you an advantage in the way Powerplay has developed", they will still have that choice, but now they'll have an in game reason that is linked with Powerplay.
In all discussions I have had over this, I have proposed mechanisms that would make PvP play a pivotal role in Powerplay. And it would mean developing Powerplay beyond the PvE mechanisms that drive it. And every time I got the response: "Might be a good idea, but it's too much work, Frontier won't spend that much time".
Without structure and limits you don't have a game, you have a chaotic mess where no-one is happy. In ED you have the BGS which is calm and orderly, and Powerplay that was released half baked with no long term vision. Its missing major features like collapse, leading to prolonged periods of exceptional stability where nothing happened, the exact opposite of what it was supposed to be.
You seem to forget too that Powerplay PvP is opportunistic that acts as a brake on PvE activities. The mega UM, fort direction and system condensation are all enablers of this. Without open within the current framework all you are doing is removing safe fortification caps and letting in potentially infinite grinding with no new gameplay. Contrast this with the BGS which has had untold changes and additions making it far more rounded.
Now ask yourself 2 questions.
1. How long has it been that the Open Only grenade was thrown?
2. Has Frontier shown any inclination to follow up on that idea?
Because fellers, and I'm talking to the PPOO advocates here, I sincerely do hope you guys are discussing this because of academic purposes, purely out of a "what could have been" perspective and not out of the hope that Frontier is at one time going to read your thoughts about the matter and be persuaded.
All we know is FD are happy with some of the proposal going by what I think Will stated, admittedly ages ago now. But from what we know in hindsight, the PP update was caught in the upheaval that was latter day Beyond- remember it was around when carriers were first supposed to be talked about, and mining. I know this because FD envisioned Powerplay being updated Xmas 2019 and around the time were keen to sort out 5C.
Now, as far as what 'being happy with'- this could mean:
1) we have a second anti 5C patch with voting on voting and fixing AD and Hudsons alignments. This would be dissapointing, because it would be then Powerplay has had two small patches adding nothing but 5C guards.
2) we have everything bar Open. This again does not provide any new gameplay, but introduces severe flaws that magnify problems.
3) we have all of it as it is- Open and all. This would replace NPCs with players in opportunistic PvP while PvE is going on. This part does introduce P2P issues as well as blocking inconsistencies, but considering the Powerplay population is below 1000 players (and possibly much, much less than this) FD may have gone for broke.
4) the silence means either its going to be retired, or a full rework. Ages ago Sandro did propose such a thing too, ironically.