Playing an MMO in VR would bring with it a whole slew of new problems far beyond simply altering the control scheme or questing structure. Can you imagine trying to dance around the AOE parties of most of FFXIV's high-end content without the spatial awareness granted by a third-person camera? Hell, just trying to accomplish jumping puzzles in first-person mode where you can't see your feet can prove to be frustrating in some games.

MMOs in VR, if the MMO genre even persists that long, will bear absolutely zero resemblance to MMOs as we know them today. Even without huge leaps in hardware, MMOs of today rarely resemble the EverQuests and Ultima Onlines of yore. Will we ever see a game that truly resembles Sword Art Online as it's presented in the show? Doubtful, but I guess there's always the possibility. With regards to a game that is 100% well and truly procedurally generated via an AI that spawns unique quests, bosses, and the like and alters the game according to the actions of the players, that seems like a more feasible goal, if still quite a few years/decades off.

In summary, what we're given is perfectly functional for the present paradigm of MMOs in general. Don't like tab-target combat? Play TERA, or B&S, or BDO. Don't like having progression bound by questing or levels? Play The Secret World. Prefer a more open, expansive, living and breathing world? There's any number of sandbox MMOs out there.