Classically MMORPG’s and Virtual Worlds did not, or could not, be translated very well into a games console environment. A number of pressures existed regarding the technology, the need for updates and compatibility issues with PC users.
This (classically) would seem to be a bit of a shame considering the size of the market share that the console market (a good, but a little dated now discussion can be found here, and makes for interesting reading.
With another excellent paper on the general industry by the Entertainment Software Association being found here)