The RNC doesn't have to DO anything.
The only threat to their plan is Cruz, and he has definite uphill battle as long as Trump stays in the race.
Of course their favorite was Bush, but they will gladly settle for Rubio.
FLORIDA'S "winner take all " primary is Cruz's biggest obstacle. He MUST take a large portion of Texas' proportionately awarded delegates to offset a probable loss in Fl.
South Carolina is the first ”winner-take-all” primary.
And the first southern state in Ted's “Southern Strategy.”