The next big mmo feature?

[Khikik]

I don't think it will be any one 'feature' that defines or sets it apart from the rest. But high polish and I personally hope focus on the core game-play and content as opposed to payment models / hooks.

If there is one thing I would be impressed by it would be a well polished VR-MMO. Unfortunately with the price point of VR systems it would most likely also have to be fully playable non-VR as the initial cost of VR would price out a lot of players.