I think people overestimate how much a 2nd PvE server would split the population, I'd think a large part of the players going there would be people who didn't/wouldn't get past lvl 30 on the current server due to constant ganking.
They're two different crowds anyways, and if we can't fit em all on one server, having both a PvP & a PvE realm sounds reasonable to me. You won't miss much anyways if that guy standing still while your slaughtering him in BRM while frapsing for your new "awesome" pvp movie decides to reroll on the PvE realm.