The one problem I can see happening if they stop making pieces different between the genders is that gear can become abit boring. Like it wouldn't lean one way or another and depending on how it's made. It could be looking more girly then manly due to how many people play females vs males. This is just a thought. but that could be a reason why some people don't want the gender locking to go away. Males already get the short end of the stick now anyway, and they want more Manly items. If the locking is taken away they fear things will still lean more girly but now everything is unlocked so they still don't get what they want.

That is just my guess.