You're too focused on the tree you don't like and are forgetting the forest. Why are you determined to punish the PARTY when the problem is INDIVIDUALS? I just don't get your line of reasoning here--my whole point is to toss out the RINOs in the primary--why isn't that the #1 goal, instead of "tossing 'em out"?
Your argument is somewhat analagous to a scene in The Maltese Falcon. Sam Spade informed some other characters that since he was the only one who knew where the Falcon was, they'd never find it if they killed him. One of them suggested that it would nonetheless be wise for him not to incite them too much, lest they kill him anyway.
Except if we DO let the Republicans fall out of power there are REAL, not imaginary, consequences. That you don't see this is scary.
If Republicans know that they'll lose if they betray their base, they won't betray their base. But the only way they can know that is if the base is willing to punish them for betrayal.
Yes--punish INDIVIDUALS. Why the heck would the true conservative candidates side with us if in the end it doesn't matter, we punish ALL Republicans? This simply is illogical.
"I was going to come down hard on illegal immigration, but these voters are punishing ALL Republicans. Hmmm, maybe I'll give Harry Reid a call..."
I see that perfectly well. I also see that if liberals take over the GOP there will also be very severe consequences. If there are enough liberal RINOs already in power that a threat to expell Republicans who undermine the borders won't keep them in check then the bad consequences you speak of will be inevitable. Now may be a bad time to get rid of the RINOs, but getting rid of them after they've gained even more power will be even worse, especially considering that the Democrats will have moved left during that time.
As long as the Republicans are in power and there is no credible threat from the GOP base, both parties will move left. I am unaware of any way to stop this except by making a credible threat to boot out the RINOs, and booting out the RINOs if the threat proves insufficient. If it will be necessary for the Democrats to have some power, better that it be now than when they've moved even further left.
Note, btw, that while the Democrat leadership is hyper-leftist, many Democrat politicians are not. Unfortunately, it's often hard to tell politicians' real positions because the positions they take when their vote won't matter often won't reflect their positions when it does.