The Establishment has seen that and now are backing two candidates, one representing the anti-establishment view (Cruz) the other one the establishment one (Kasich).
I want Kasich to drop out because he cannot win the majority of the delegates and is therefore only remaining in the race to fight a convention battle.
Likewise with Cruz when he is mathematically eliminated.
I doubt few Cruz voters would vote for Kasich, I know Trump voters wouldn't.
What the establishment is attempting to do is what it has always done to get their guys elected, divide conservatives, in this case religious conservatives (Cruz) and popularist ones (Trump), while Kasich slides through untouched.
If Kasich were leading the RNC would be putting all kinds of pressure for both Trump and Cruz to drop out for the good of the Party.
Some states have been anti-establishment, but others were pro-establishment. I do not want to give the pro-establishment forces a chance to unite. If the last few primaries are a two-man race presented as an up or down referendum on Trump, even people who don't like Kasich might vote for him to try for a "compromise" candidate at the convention. Party leadership would even argue that they were justified in treating that as a public rejection of the Trump nomination. The rules changes to deny Trump the nomination would be "to meet the public demand". No, thank you.