I've been mostly playing healers and tanks, so I didn't realize how hard some of the DPS have it in the game with their action bars. Even if you think the number of abilities are fine now, it is only going to get more bloated as they add new abilities with each expansion. I think, at least for the first expansion, keeping the number of keys needed for ability activation to a minimum should be a priority.

For instance, on monk, why not have the first three keys dedicated to combos? When it starts out on a fully leveled up monk, there would be snap punch, arm of the destroyer, and dragon kick. After the monk uses one of these three, the three keys shift to the couerl form bar that contains true strike, twin snake, and one-ilm punch. It would require a reworking of a cooldown, but it would keep the number of buttons used to a minimum.