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I think the first MMORPG that comes out, innovating in ways to get people playing together rather than separating them, will be a huge success.
Level synching so you can play with friends that are lower level and still get a benefit out of it.
Scaling raids / groups to fit group size, rather than trying to build your raid to fit them. Set a min / max for each. Maybe 10 minimum, 40 max. And have the raid scale to you, rather than not being able to raid because one or two people couldnt show up that night, or having to sit people out.
Multi-spec, I like what WoW/Rift have done with this.
NO TWO FACTIONS! Don't split the player base up. If you want PVP, have 3 factions that can fight when they want, or group together when they want.
Either Free server xfers, or a better way to bring friends together if they aren't on the same server. (suggestions?)
Anything else you guys can think of? Or do you think MMORPG developers should still focus on the RPG aspect of the MMO, and wonder why people don't stick around.