I disagree. BioWare has always had a dedicated team for PvP. That's not what developers do if they're just going to "tack on" PvP. The proof is in how well-done WZ's are, and the fact that a much larger percentage of the population partake in PvP here than in any other MMO.
Don't let the failure of Ilum overshadow that fact.
The warzones are not well done, they are still buggy as hell and easily exploited. PvP use to be popular, but now it's fading faster then the game.