This is GOOD news!! We should be happy an RNC person said this.
Trump has said that there are a number of GOP players who can't publicly support him, but will if and once it's clear he is the presumptive nominee. At some point, that dam has to burst. Manafort says this turning point is middle of May, Trump will NOT have 1237 bound delegates by then. It's impossible.
There is another post on this thread, don't recall the poster's name, but I think he has his fingers right on the money. This race was over with Florida and Ohio. The real fighting now is over how many strings the GOP/RNC can attach to Trump. Looks like "not many." But you know the party regulars are going to fight; and face it, some people genuinely like Cruz, and some people genuinely hate Trump, on what is in their minds totally objective and reasoned basis. Those sentiments are durable beyond the results of any election contest. NR isn't going to regain any credibility by reversing course and supporting Trump in the general election!