Bethesda is in my opinion the best PC-RPG developer in the industry. I began with Daggerfall, and never fell out of love with the work that they have done. My second favorite genre of PC games is clearly MMOs.
If Bethesda could take the greatest elements of their RPG series (Elder Scrolls; Fall Out, etc) with their open world format, and get that to work within an MMO....My God, what a game that would be!!!
I don't mean a WoW clone or the new versions that feel that "Sandbox" or "Open World" MMOs don't sell. I'm hoping for a Bethesda RPG with multiple players in the game world. An MMO that does not force us to follow a storyline, nor group up for raids, or to grind for the new color of end game gear....Just an MMO that lets us follow our own paths in Bethesda's world.
Of course I would prefer the first to be based on Elder Scrolls, but the Fall Out series would be awesome as well (closest thing to Fall Out MMO I have found is Fallen earth).
So please Bathesda, consider developing an RPGMMO (Note I did not say an MMORPG, for what I hope is an obvious reason).