Okay, here's a question. Let's say Anet does throw this switch, make on open world PvP world and leave it as it is in every other world...but because that world is a minority, there aren't that many people, what happens to all the events that are out there that you don't have enough people to do. Events that will never trigger?
See everyone keeps saying you just throw a switch, make one change, set one flag and it's done. Do you really believe that's the end of it?
Do you really think that if there's not enough people involved, that people won't start complaining about not being able to do anything contentwise?
For one thing, Tyria is huge and if not enough people are involved, the odds of meeting people to fight in the open world, is not that big. In off hours, people already complain on low pop servers about not having enough people around in certain zones to do certain events.
In addition, the culling will have to be adjusted, since the game seems to blank out allied players (which is everyone in PVe) because they're right on top of you.
Everyone says, just make this one change, and we'll never ask for anything again. Until they do. And they keep asking.
So if Anet did make that change and it didn't work the way you think it did, and you didn't have the people, and you couldn't find the fights because the world's just too big (which is why having only a few zones is brilliant), do you think you'd like this game better?
Game design isn't happenstance and very few things are just added willy nilly like that for a reason. It's because once a company does it, they have to do it right and then they have to listen to the complaints.
What happens when everyone agrees we'll all go here, and fight because we can't find anyone, and the zone fills up, and then two guys end up by themselves on the overflow server? What happens when in addition to the zerg, if there is one, another NPC zerg comes in the the frame rate gets so low the game is unplayable?
There's a ton of things that might be affected, that no one here can even think of, because we're not game developers and we don't know the code.
But I think it's very unlikely that anyone can just flick a switch and make this happen. And if they can I think it's even more unlikely that they PvP community on that server won't start complaining about something, be it an exploit someone figures out, or something else.
And then, it would be no longer just flicking a switch.