"We doubled it." At the end of the day that still doesn't seem to be enough for ranged classes or well-coordinated groups. Blizzard claimed that they want to create "viable specs", not just a few "optimal specs", but in the current state the only Barbarians who can get past Act 1 (still has to run away from most elite packs) is a sword and board Barb. Any other spec is not viable for a Barbarian with BiS gear from Hell.
If Inferno is meant to be a coop mode, then don't advertise it any otherwise. If Barbarian is incapable of reaching the height of a ranged class due to class limitations, then put that there during character creation. The problem with too many options is that the options will not get as much testing or balancing as a smaller number of options would.
PS: I didn't talk about Monk because I'm not sure how viable it is for monks to solo Inferno. I've heard of monks doing Inferno, but all of them were tanks in coop games.