I've been like a lot of other people when it comes to John Kasich, talking about how he really needs to just get out of the race already because he's hopelessly behind (even now he's in fourth place behind Rubio in the delegate count) and hasn't won anywhere except his home state. In the meantime, anyone who believes as Kasich claims to that Donald Trump should not be the nominee should see that Kasich's continued candidacy is helping Trump by preventing those who share that sentiment from coalescing around Ted Cruz.
Why would stay in when you don't have a chance to be the nominee and you're helping Trump?