At lower levels I'd say there are more monks than the other two. Perhaps slightly more rogues than bards lately, but it's close between those two. I seem to end up in lots of tankless groups, so I'd say monk would probably be most in demand out of those three, with the melee DPS of a rogue next, and if you consider the bard to be competing with shaman/druid for a utility spot, then they'd bring up the rear.
Edit: Having said all that, all three are rare and in demand in groups compared to most other classes save pure tanks.
That's entirely based on the sub 20 levelling world which I'm guessing is what you care about. If you're talking about raid level demand, I have no idea.
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