So when are KAsich and Cruz going to come clean and announce a unity ticket, with Kasich as the candidate and an Cruz as potential VP?
the 'logic' being that Kasich's supports will not vote for Cruz as the nominee. They'll probably sit out the election or defect to the Democrats rather than vote for Cruz or Trump. Cruz's supports might vote for Kasich, especially with Cruz on board and making scary rightwing faces from behind Kasich's shoulder. But I doubt Cruz's supporters will vote for Trump in great numbers. If there were inclined to jump to the good ship Trumptanic, they would probably have done so by now.
Kasich is also the only nominee who is polling ahead of Clinton and Sanders. While there might be a bit of "Who he?" factor at play, it looks like the Republicans have to stop bein silly and nominate somone capable of winning, and there is only one candidate who looks likely to do that, and probably only one combination with a realistic chance of stopping the Trump Self Immolation Juggernaught of Doom.