http://us.battle.net/d3/en/blog/6018173 ... _2012#blog
That said, we also wanted to let you know we’re keeping a close eye on Inferno. The intent of incoming damage is that it should be a very consistent drain on your health, and mitigating that drain is a major part of what makes Inferno mode difficult. Right now, there’s a lot more damage “spikiness” occurring than feels right, and that’s one major area we’re looking to adjust in patch 1.0.3. While we don’t have any specifics yet, our design goals are to support and promote build diversity; continue to ensure that a mix of champion packs, rare packs, and boss fights are the most efficient way to acquire the best items in the game; and ensure that all classes are viable in Inferno.
It's actually the spikes that make Inferno impossible for Hardcore right now. So if they change it from burst to damage over time, it will start to become possible.