As with all things, they either evolve or they die. The Republican Party is the party of dinosaurs. If they don't adapt they will die out and a new, stronger party will take their place. The finale death bell for the party would be to nominate another Romney, McCain, or similar bland bowl of gruel from the old guard simply because they are old guard.
Dr. Benjamin Carson proved that there are dynamic people out there. If the party can't tap into them it should die and good riddance!