> But will the Republican voters ditch the party in mass for another? <
No, as you noted. Part of the problem is money. It would take an enormous amount of cash for a new party to get its message out. And that cash is just not there.
The big money Republican donors, they like things just the way they are.
Well it is too late now anyway. We missed that window in time and we will NEVER get another chance again. Elections are now just an entry into the history books. But very little money needed. A coordinated mass exodus will immediately send plenty message. Just like Bud Light.
And the big money people will follow who they think can and will control political power. They already switch around at will depending on which way the wind is blowing.