I'm purely laying out the numbers as far as I can see them. Are you saying that you've been arguing against OOPP all this time to troll a unanimous community? If it were unanimous there'd be little to argue about. A substantial benefit to a majority vs. a smaller detriment and to a minority would be grounds for a change, as I see it. And please don't now again restate the obvious uncertainties around the numbers, it's tedious.
Obviously not - as the whole premise of OOPP is to stop players who currently engage in the feature in Solo and Private Groups from doing so - which means that some do so, which means that the Powerplay community is not of a single mind when it comes to Powerplay itself. If the Powerplay community was unanimous in its opinion then there'd be no need for Open only Powerplay.
"A substantial benefit to"
which "majority"? Those who currently engage in Powerplay are not a majority of the player-base (and not all of those who do engage in Powerplay do so in Open) - yet the whole player-base would be forced to play in Open if they wanted to, at any time in the future, engage in Powerplay if it were made Open only and the feature forms part of the game that the whole player-base bought on the same terms.
The conflation of OOPP with bunches of savages running around lopping each others' heads off and cackling all day is odd. OOPP cements PvP's role in the feature, but it's not "the PvPers" asking for it, it's the whole spectrum of participants. I wanted this (or whatever optimal way to maximise engagement in open, or at least balance the modes so that open PP is not penalised) from when I joined in a cobra with 10mil credits and no engineering until now, and I see the broad swath of players of all levels engaging in my group totally happy to play in open. It's about wanting an oppositional, explicitly multiplayer feel to a feature where that seems entirely appropriate (i.e. a multiplayer simulation of some kind of semi-clandestine conflict, which is what PP is).
No conflation - simply the observation that Open only Powerplay would require any participant to play among all other players in Open. When engaged in any game feature in Open one may meet any type of player, for better or worse, whether or not those players are engaged in that feature.
Rather than "take away" any feature from any player (in their preferred game mode) to suit a subset of players by changing a fundamental aspect of the game, i.e. all players have an equal effect on the shared galaxy regardless of game mode, it would be better to change a different fundamental aspect of the game, i.e. the singularity of the shared galaxy. This would give those seeking Open only gameplay a galaxy to call their own, to affect from a new Open only mode - and leave the tri-modal shared galaxy as it is for players who accept the optional nature of PvP in game features.