Actually, the story in my head (until Nimoy passed) was a super duper Older Spock (Nimoy) using any and all means necessary, including periods of self induced coma and/or cryogenics, plus advanced anti-aging techniques, to stay alive long enough to be there for another attempt at the end of the 24th century to stop the Supernova, with Quinto Spock as Old Spock assisting him, attempting to set things right and save Vulcan. Older Spock's final act before he passes would be hitting the button that saves his home planet and the timeline.