Haha! We're already there. The GOP lost its conservative edge after 2004 IMHO.
At the National level -- the RNC -- yeah, I'll buy that, but not out among the States. Many -- if not most -- of the State GOP Committees are still pushing conservative candidates, especially for House races. THAT's where we have got to invest our energies; in turning those State-level selection and vetting processes more to the conservative vein (or bringing them back from the brink of abject leftist RINOism, as in the case of California). Where you choose to jump in has to be based upon your assessment of where you can have an impact. If things are too far gone at the state level, then you step down to your local district level.
This has got to be undertaken just as you'd remediate dry rot in your house. You've got to mercilessly tear into the walls, all the way down to the footings, and root out the decay from the bottom up; replacing the rot with sound wood AND taking additional steps to prevent recurrence.
It's the only way, and it has to be done, regardless of the time it may take to do it.