The next day the whole school stands up against Mr. Nolan and keeps the boys from being suspended for their actions. Then after lots of convincing and lawyers getting involved, Mr. Keating gets rehired and becomes the head of the school. He fires all of the teachers and administrators that accused him of being responsible for Neil's suicide. Then he expels Cameron for being a jerk. In the end he turns the whole school into Dead Poets and Todd gets to be in charge of all of them since he cared so much about Neil. In the end, everyone lives happily ever after...except for Neil.
P.S. Eventually Kris and Knox get together, but it takes a really long time.