Kasich never had a chance in the last election. If he thinks sabotaging his own party and supporting Hillary in a presidential election has made his chance improve, he’s even stupider than I thought... which doesn’t seem possible.
I don’t think his object is to win, it’s to pull enough votes to hurt Trump. On the other hand, he seemed remarkably sure he would win the primary in his last run. Delusional, but sure. Idee fixe you might say.