There needs to be a firefly (as in the space western) mmorpg. that universe was MADE for mmorpg!
I feel that although intergalactic MMOs are cool in theory if there is space travel involved it would be stupid to not make it realistic. This means its stupid to make it a MMORPG because drifting through space and meeting no-one is not fun. Also if you can't explore every inch of a world you could theoretically land anywhere on its just not cool.
Solution would be to limit it to a single solar system to get the details required but then it just wouldn't be the same :(