I wouldn't necessarily say that's true. Sometimes having 1 person down happens due to DC's or just someone that isn't adequately geared. Having all the content impossible with 1 person down would probably kill the casual population, and make it incredibly difficult for others. If you think gear checks are bad now, they would be mandatory with that kind of system. Which isn't to say that isn't the direction that we're heading in now with the ilvl minimums.

A game has to have some leniency due to this factor and not punish the rest of the individuals. Vote kick in my opinion leaves the power to the people, allowing them to make the decision.