I'm not sure but I think putting an MMO on a console would be hard and even if it wasnt hard it wouldn't be updated as much as PC as it is cheaper to update on a PC than on say an Xbox 360.
Assuming that this Megaserver tech can also handle cross platform stuff (Which is a point we don't know) then you point would be moot. If it could we could play with all the PC people and get updates the same as everyone else. The only issue would be controls, and assuming that the game works similar to Skyrin that could be mapped for such.
But then, such a idcea would hinge entirely on the fact of Megaserver being able to handle cross platforms. I think it MAY happen and have that in design, since to cut off their largest playerbase of the ES series would be folly.
However, I will admit the only reason that I think this is because on the Angry Joe show Interview at E3 they said they would not comment on Multiplatform at this time. If it wasn't they should have denied it outright. My guess is it won't be for launch but they will work on adapting it to Xbox using megaserver tech.
However I may be wrong. (: