I agree with the gist of what you have been saying. We are in a war with the liberals and until our side understands this fully, we will continue to become fractured and less effective. We must fight the liberals as a coalition as if our lives depended on it in the same way the U.S. and the U.S.S.R. joined forces to fight Hitler.
Essentially, it's the same strategy as one would like on the WOT. If the West is going to win, the West has to be united. Similarly, if Republicans are going to succeed (or, survive) they have to remain together. This doesn't mean we have to accept liberal RHINO philosophy within our party. It means we have to reorganize our party into a conservative body that has the ability to get its message across to the American public.
Sure, there will always be those to the left of us Conservatives within the party. But they will be the minority and, as such, their presence can actually be a plus. Presently, they're disruptive and contentious. Instead of breaking up the Republican Party; thereby marginalizing the Conservatives, a strong Republican Party with true Conservative credentials will insure that the RHINOs will indeed be the marginalized subset.