There's nothing more important to an MMORPG than the ability to feel like you are an unique character in an emergent and socially engaging game world. VR will always do this best.
VR will improve the social aspects that people find lacking today because people will be much more inclined to seek others out.
VR will improve the one dimensional gameplay style that many MMOs have today since you will have to pay more attention.
VR will improve the escapism/immersion aspect and you'll be able to live basically a second life if you want to.
VR will improve your character/individualism by allowing you to express yourself much more and give you much greater agency in the world.
I expect that in the 2030s, VR will dominant MMOs and the idea of playing such games on a monitor will be laughably archaic and passed off as retrogaming. Obviously by that point all the current issues of VR will be fixed and no I'm not talking about some silly Matrix brain interface because that's fantasy, I'm talking about headsets like out of the movie Ready Player One.