Also, will this to apply to all classes? Each class has ways of helping party members, but I think for the monk the heal is very apparent. For example, would people be upset at a barbarian not using a war cry, or a witch doctor not using some of the stronger crowd control options?
Ultimately, I think all classes have the tools to insure their self-survival, whether it be heals, life leeching, armor buffs, evasions, shields, or having mobility. But, if you want to play on a team in later difficulties, I think all players should work in some skills that benefit everyone.