You make an excellent point, and I think most conservatives share your desire for a more ideologically conservative party. Here's what worries me about your position, though: even if you are correct and ultimately true conservatives prevail in an intra-party fight, what if the price, short term, is something like a Hillary Clinton presidency? I don't think the kind of fight you envision is something resolved within a year or two between elections. Is the long term victory worth the shorter term losses from a divided party that would put government control with the left? And if so, how long would it take the conservatives, assuming they prevail intra-party and electorally, to undo the damage from Democrat control? There are high prices to pay no matter which course of action one favors, I think.