Long story short: the doctors are so unsure that they're not even willing to give any sort of percentages of whether or not he'll make it, or what kind of problems he'll have assuming that he does.
That's one of the things that's bothering me the most. He looks bad. He looks just alive enough not to be dead, but far too bad off to be anything close to "good". He's caught somewhere in the middle, and I can't imagine what kind of agony he's in right now. And since his vitals are good, he may be fighting this battle for a while, whether or not he ever leaves the hospital or even regains consciousness.