Or at least a proper PvP/PvE flagging system so that a CMDR who wishes to engage other players knows immediately whether or not they're "fair game".
Perhaps segregated universes isn't on the menu... but a proper flagging system (with a timer to prevent abuse) which prevents players from engaging or being engaged unless they're flagged is still completely doable given the current framework. Hell, they wouldn't even have to create a different game mode for it. Sure, those who want the ability to engage anyone they wish wouldn't like it... but I'm sure they like players they can't see or engage indirectly affecting the universe even less.
How should that flagging work? When we have dealt with obvious thing, no pew-pew on other player... what about interdictions? should that be a blocked too? what about collisions? should these be removed to?
Because to truly add something like this to the game, you have to account for all the forms of interactions players can do to each other....
If we do not account for collisions between players, as that have been used to kill other players using collisions only. Especially around stations, first you could ram players to death, so bigger ships rammed small ships, so to avoid this, we got speed limit and if you are speediing and a player runs suicide collision their sidewinder into your ship, the stations simply considers this... you was speeding, collision happened, other player dead ------> you are obviously guilty of killing other player, stations opens fire to destroy your ship.
Another situation, you are in conflict zone, etc and are pushing and both your shields and hull are low, and out of "nowhere" another players makes a sneak ramming attack on you and destroys your ship....
So we can remove collisions damage, and that is going to produce some really strange results.... so I run my ship into your ship and either of two things should happen, no damage, but physics enginge is working, so I bounce of you, knowing the physics engine, with a tremendous velocity.. or I can push you around, while we take no damage, but you where pirate hunting in a REZ site, so while I pushed you around, you missed your target and now shoot a "clean" ship and got wanted....
So we remove collisions between players, so now I fly right through your ship... over and over....what will that what you can see out of your cockpit if I simple fly so that your are inside my ship? that will obviously not work that well and people can be pretty annoyed if players keep doing this to them them enter/exits a station.... so we have to make the the "other" ship transparent... so it will not block the view of the first ship.... and now several players can simply enter/exit a station at the same time with out taking turns as we used todo....so now players starts to boost in and out through other players and of course, they will randomly ram a NPC ship and complain about how that is unfair... etc, etc...And not to mention how all of this makes no sense....
Basically, Any PvP flag system, PvE Open , etc, will not really work unless we makes massive changes to the game and the player to player interaction.... and this is why modes are a good solution, as instead of trying shoehorn no player interactions into the same mold where we can do PvP, they simply let players choose a mode, do I even want to play with others? go solo, do I only want to play with friends, use Private Group, otherwise you have the Open mode to choose from...without to having do strange things like the above...
What most PvE really dislikes with the current system is that they have pay for the lulz of other players, with their time, rebuys, lost NPC crew, lost cargo, failed mission etc, just so that a few player can have their way of fun.... so one of the other solutions to this could be to reduce the effect of death to another player has...
So if I kill you with a full load of void opals, you just lost 500 million+rebuy, what if you got an option to get your ship restored to the previous system with all your cargo intact, now you have only lost some time.... you lost some time, compared to the hours of mining you have done, etc, the time lost is minimal... and now it is you who can laugh at me, for my daring attack on your ship etc, you lost basically nothing, so once you are back in the game, you can now use the option to block me, mode switch etc, and be on your way...so what reason would I have to blew your ship up now? if you are not going to be upset and sending me "nasty" messages about what a lowlife I am etc, the entire incentive for me to kill players just because they are players, looses it meaning... and as a side effect, this would remove ALOT of the stigma PvE centric players have about PvP, so they do not panic exit to menu (a perfect valid strategy btw) when another player interdicts them, they might even stick around and fight... since they have nothing to loose but time...
This could potentially lead to more players engage in PvP activities... of course this is a very simplistic explanation of a solution like, as there are quite a few "issues", to be considered and solved before it gets implemented.... otherwise it could be abused... there are no simple solutions to complex problems....