The GOPe want the immigration issue to go away and the amnesty pimp $$$ to come in. Their miscalculation is the Dems never give up an issue. If amnesty passes blue state GOPers will become a rare breed. Their base will abandon them and the Dems will scoop up the seats.
The Republicans ought to consider what the Simson-Mazzoli amnesty of 1986 did to their hopes and dreams in California. Up until that time, California usually went Republican in presidential elections, and the GOP held the state house for 72 years during the period between the Spanish-American War and the Kosovo War. Now the state is irretrievably “blue,” and the California Republican Party is moribund.