Thanks, Visitor! I knew that.
A tiny part of me is still worried that he might appear in flashbacks or dreams or -worst case scenario - sylared like in FYG...The main reason why I think he will survive (apart from starting his speech with the words, "At first, I was afraid", which was a dead giveaway

), they can't cry wolf
again. Nathan was presumably dead after season one as well. I keep telling myself this wasn't supposed to be a finale, just became one after the writers strike, and is just a major cliffhanger. And those always end well...