The GOPe will not consolidate behind him any more than they did in Mississippi and Alaska. The GOPe would rather lose than see an outsider become President.
He will get the same support that the GOP gave Goldwater in 1964.
Open derision on the stage of the convention and endless attacks in the press warning of TEOTWAWKI.
They will openly support and contribute to the Democrat to prevent a "right-wing coup and protect the American way of life".
That's what the Republicans would do.