I have a theory, or maybe a question, or it may be something already addressed and I didn't take the time to go through this mammoth of a thread and read it, but here it goes.
I feel asleep last night reading Ultimate comics, when I woke up, I resumed reading at the same place I left off at. This seems to be a common, and happy, since I hate the act of falling asleep myself, occurence that happnes to me. Half the time I don't even realize I fell asleep, anyways, when I awoke, I saw the page in which Joe Liberman runs off to save the people in the burning house. They said his nervous system fried.
Okay, so maybe the moment he started to 'use' his superpowers, he overjuiced on them, and died.
He supposingly accepted the super soldier serum as well.
Now, let's say that This 'Colonel' has yet to have an extreme test on himself with these new superpowers. He may also burn out after he uses them as well.
Which would be a nice copout ending Millar is sometimes known for afterall.
Just a theory.