I don't see how Kasich gets on with just Ohio. There have been plenty of Favored sons in the past and Kasich is no different.
If there's a Trump collapse in the NE - but I just don't see a path where he stays on the ballot if it goes past a first ballot.
2008 was very strange, with Huckabee getting 8 states, Romney 11. Only time in history the nominee had two candidates with that many states, and the only time the eventual winner got fewer than 50 percent of the primary votes.
There are 19 states left, Trump only has 37 percent of the vote. There's still another 7.6 million votes out there, and Trump has to get 4.2 million of those voters in order to get to 50 percent plus one.
That's 55 percent of the remaining vote.
It's getting harder and harder to see the Republicans winning the election regardless, so at this point nominating Kasich on like the 30th ballot of the convention isn't obviously worse than the other options.
Maybe the best option is to have like 30,000 ballots, and keep the convention going right through the election, with nobody getting nominated.