I think PvE server would do good for the community as a whole. That being said, i don't want to see the population go way down. It's how realms start to die. I think we all know the stories of raiding guilds going to less populated servers only to break up and die due to natural attrition and not having enough people to recruit to fill their ranks.
I only played for the social aspect and loved seeing a billion people running around - forcing them to group up doing the most basic quests. That's the only thing I care about. But I'd definitely play again if there was a PvE server. Given my schedule, I have to afk at regular intervals. I almost always end up coming back to my corpse.