My goal is to get a Republican in office who matches my point of view on what I consider to be the main issues. Number one for me is fighting the war on radical Islam. As far as I can see, all the current GOP candidates will do a good job of that. I also know that virtually any Democrat who runs is likely to surrender.
That means that I will support ANY Republican candidate who runs, whether it be Mitt, McCain, Rudy, whomever. And I don't fear a lick about "conservatives" staying home. Their number will be far outweighed by the number of middle-roaders who vote for the GOP candidate.
You are very wrong. Without the enthusiastic support of conservatives, republicans DO NOT WIN. Witness Ford's defeat in 1976, Bush I, defeat in 1992, Doles defeat in 1996. Conservatives support does not alway engender victory but it loss assures defeat. Republican would be wise to learn that lesson. Conservatives make up by far the largest portion of the party and republicans do not win without their support.
If it works out like you expect, then expect the GOP to be utterly devastated in the down-ticket races. Losses at the local and state levels will set the party back at least a decade.