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I know, it's a wide sweeping generalization and there's always exceptions, but after playing MMO's for 10 years and after reading the SWTOR forums, I'm convinced that PvP doesn't do any good for MMORPG's anymore.
PvPers are constantly complaining about balance, when in fact judging by my own experience and experiences of others, the perceived imbalance is actually a lack of player skill and/or the choosing of a class whose mechanics don't fit naturally with their playstyle.
If there isn't PvP, developers can worry less about class balance, which I personally could care less about anyways, and pay more attention to social features, PvE content, and RPing features. Not to mention, it'd get rid of all the bickering that revolves around PvP mainly.
My first MMORPG was DAoC and my second was SWG, so I PvPed a great deal back then and I loved it. People banded together to overcome the enemy. People weren't worried about kill counts, or similar things. They were worried about completing large objectives, such as driving the enemy off their land or reclaiming castles and relics. PvP like this, I like, but the PvP matches and e-sport PvP has brought in a new type of PvPer who doesn't really bring any good qualities to the community. They're selfish and more concerned with what rewards they get out of playing, and how their class stacks up against the rest, rather than cooperating with other players to achieve something greater.
I've enjoyed the warzones thus far, but I can do without PvP if it got rid of all the crys for nerfs and buffs, and that's coming from someone playing a Marauder, which people are complaining is underpowered and not good at PvP.