Kasich looks viable as a spoiler if NeverTrumpers want to elect a rat instead. I don't know if I would take the time to support Kasich just to defeat Trump, but I might just to poke an eye in Trump supporters who are arguably more corrosive, obnoxious, and abusive than Trump himself. I really don't see much to lose...MAGAwise.
If the rats offers a candidate that embodies a rejection of the past southern rat xenophobia, a walk back from pro-union tariffs, and showing the respect of even paying lip-service on issues of abortion, limited government, and public debate and transparency before passing legislation, maybe I could vote for Kasich. If the rats choose an equally repugnant candidate as Trump I probably also vote for Kasich. I doubt he runs. I think he's just collecting money.
Kasich was low on my list of 17 last primary. Just above Trump and Cruz. If I thought he could beat Trump I would support him today with many fewer reservations than I had in 2016.