I would argue the opposite - for MOST PvPers, combative player-on-player PvP IS exactly all PvP is, not merely a part of it. For MOST of the PvPers who post on these forums, I would argue that playing PvE mechanics to get their fix of PvP doesn't even come remotely close to what PvP 'is' for them, based on the language many use. I think we both agree that PP has a PvP objective (Power competition being driven by opposing player behaviour and actions), but the mechanics for executing it are PvE focused (ie player actions influencing the BGS behind each Power, countering the PvE actions of other players), not combative PvP. But it's only those PvE mechanics that most see - because PP participants can participate in PP without actually ever seeing or encountering their opposing players, even in open, for them it is PvE and it might as well be NPCs on the other side. And thence there is almost no difference between the modes - if they don't see other players in open just because of the P2P and matchmaking, which is my experience, what's the point of an incentive? Overt combative PvP combat actually has little to do with PP in the main, even though PvP combat is what most PvPers want. Incentivising PP to favour open play won't have the effect some desire. Those that have no interest in combative PvP won't suddenly switch to open, to be targets for combative PvP zealots, simply because of an incentive to do so - and the alternative of making PP open-only would be in direct conflict with all 3 modes being equal, a state promoted previously as being effectively set in stone. Discussing options is fine, and I would expect Frontier to discuss it as part of the ongoing design process, but implementing it is a different matter.
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Those that seem to think that encouraging people to play PP in open (by incentivising open participation over the other modes) will somehow suddenly enable them to instead use combative PvP as their principal method to directly oppose player PP actions need to remember that because PP is based around PvE mechanics (to indirectly achieve PvP), the most effective way to oppose other player actions is in fact by playing those same PvE mechanics themselves to promote their Power's cause, not hope that the P2P and matchmaking will provide them targets for combative PvP. And for that, the mode played is irrelevant. Playing PvE mechanics to achieve a PvP effect/outcome is NOT what I perceive most PvPers want (and that's fair enough I might add) - they simply want targets to shoot, and THAT'S the underlying reason why some want such incentivisation of activities open, not some generous desire on their part to make PP more effective.