Why would they? They can’t stand him either.
The GOPe does prefer a malible Trump.
1) Most establishment delegates will do what they are told.
2) The RNC can change the rules of the game. They have set aside a period one week before the convention for the declared purpose of changing the rules as needed.
3) The establishment is in the current situation because it tried to use central planning of their politiburo to prevent the many candidates in 2012 ... to prevent the Bachmans, Cains, Newts and other non-serious candidates.
4) The establishment never learns that central planning does not work. They dont realize that the current situation is a direct result of the RNC trying to do central planning and trying to prevent a free market in the primary process.