Palmer collapsing at the end of Season 2, completely out of nowhere?

Then maybe some sort of "The-show-is-over-but-the-work-isn't" ending? Jack realizes that his country, and his world, will always need him, and accepts that he'll keep doing this until he's too old to fire a gun. Then it ends with him answering his phone- "Yes Madam President. I'll be right there."

Over the lives of Renee, Audrey and Kate. But he can only choose one to save. And they're all REALLY pissed at him for stringing them along for a few days each.