I don’t see why they don’t just start twisting Hatch and Kyl’s arms (literally if necessary) until they agree to the nuclear option. The excuse that “then the democrats might do it” doesn’t hold water because the last time they held the senate THEY ALREADY DID IT to pass goddamn Obamacare! They’re going to do it whether we do it or not, you Turtle!
Republicans simply don’t have enough votes, and there is little or no way to twist the arms of retiring senators, like Flake.