I think Kasich is a late bloomer in the race and someone who doesn't have any sizzle at all. Not disagreeing that he might be a great candidate in the right circumstances, but he is as bland and overshadowed as a cow mooing next to the train horn blasting as it approaches an inevitable collision. Getting behind him is a waste of time. Compare him to Guiliani or Bloomberg who both have a great following in NYC but that means nothing nationally.
As my great demotivator poster says, "Sometimes hanging in there just makes you look like a bigger loser".
If you think that means Hillary wins automatically, you might be right. But you might be wrong - Trump is definitely maturing as a candidate, and he probably does have some actionable ideas to back his promises. The opposition is totally blindsided and has been wasting their time making stupid anti-Trump statements, like calling him a dictator or saying he will create a war with Mexico, and generally stating disbelief that he can make good on any of his promises. They are shown to be fools when he proves that he actually has a plan (as in the wall), and suddenly they have to figure out why his idea is a bad idea instead of that he has none. If they had instead taken him seriously and actually expended some energy on criticizing and smearing his name for real things then he might have been out of the race long ago.