Whatever gets more Powerplay in Open, I support! I run an Open-only Powerplay squadron and we are currently the top Aisling squadron this cycle, we've been hauling, undermining, doing BGS work, and engaging Federal opposition in PVP, and there's been nothing like the presence of Federal commanders to get everyone engaged and excited about Powerplay. My primary motivation was realizing that when the Feds field truly impressive blockades of important stars, with two or three wings of CMDRs, that all the effort they put into coordinating and preparing for that can get bypassed by utilizing instancing mechanics. If at all possible, keeping Powerplay in Open so that our work isn't wasted and all factions can still directly oppose enemy action effectively!
If that can't be done, it would be nice if we had some way to protect or attack systems on a server level. If we had an activity that we could perform to increase NPC presence from our faction in the target system, in a way that would also affect players in Console, Solo and PG, that could be another way to solve the issue. If we could ensure that there are going to be more wings of Deadly/Elite rank ships, especially Anacondas/Corvettes/Cutters interdicting enemy-faction ships in space and appearing in Undermining spawn groups, we could do a lot to resist enemy action by those that we can't enter instances with.