Well I wouldn't even vote for the conservatives if they changed they're values to those of the Democrats. They would basically be democrats who have the same economic views as the 2012 conservatives, and I would hate them almost as much as Democrats.
"Unless they are 100% like me, I won't vote them. " Reality dictates the necessity of sacrifice and priotization in goals and principles. Otherwise a winning coalition is completely impossible and then you will loose on 100% of the things you want. Thus is the failure of such logic.
What do you define as "being like the Democrats"? Would a greater splash of Libertarianism be regarded as such? Would utilization of states rights on social issues be considered that? Would an equal dialogue on Foreign policy between Hawks and Paulites be considered to much of a concession?