To be fair, WoW BG's were never that competitive, even before they were cross server.
They just had long queues. And usually one faction dominated every single BG.
I don't think TOR really has these problem (at least on my server), but the whole argument that cross server Warzones/Battlegrounds ruins a PvP community is ridiculous.
I've never seen a real PvP community in an MMO unless there was amazing world PvP in it, and this game just does not have that. And regardless of the changes to Ilum, it probably never will.