So I have been thinking about this the last couple of days; can a MMO be really successful (1 million and above subscribers or F2P people that spend cash monthly), if it doesn't have any raiding or dungeons or anything like it (WoW scenarios, group quests that are without bosses and such, etc.)?
I haven't been able to find any MMORPG that was succesful in this way (please feel free to inform me if I'm wrong on this).
So first of, do you think it is possible? And second; what kind of features do you think could get people into the game and keep playing it for a long period of time?