Idea for InfernalsFollow

Hey i was just reading some arguments about how to make infernals worthwhile. Most of the people who used infernals in beta complained the risk of losing control wasnt worth the increased damage. What if infernals had an upkeep? Say, every few minutes the infernal would consume a soulstone or else you would lose control of it? Just a thought, please give me feedback on the idea.

cool idea, if they would add it all we would need is to have a bag full of soulshards, and just keep making some during fights. :)