Evolution does not imply a motivation to change and has no intent. It is about that which survives.
If this campaign is as disruptive to the party as it has been popularly made out to be then there will be no cohesively functional GOP party remaining, if there in fact has been one this cycle with what Congress, especially the House, has been like. Some predict down ticket impacts of the cycle such that not only the Senate is lost but that the GOP loses much of their House majority as well.
The question is what emerges from that, not as an immediate or even rational response, but over a few cycles as that which survives and gains strength.
If the elements cannot survive in their current federated form what comes out? If the animosity grows to the point that Ryan cannot pander enough to the still minority but even more extremist and angry populist elements.
I can make up all kinds of events from there … including a prolonged period with no House leader until some elements of the GOP end up coming with some compromise with Democratic members of the House on a candidate that serves as a consensus between them, and give a metaphorical finger to their own other side.
In that context where then do the GOP big money players and lobbies place their bets? How do the no-compromise elements respond? Do they leave? If they do does the remaining element of the GOP, which subsequently loses their majority House status, actually become a place not anathema to elements which the Democratic side must have the overwhelming support of (Blacks, Hispanics, suburban White women …)? I can imagine a cycle or so leading to a Democratic party becoming increasingly beholden to its most “progressive” elements and a GOP with the populist authoritarian wing having split off (to wither over a cycle or so) now increasingly centrist … but I can imagine many other paths too. I just doubt that the current species of dinosaurs will be dominant after the asteroid, even as I do not know if we should bet more on birds or on those mammals scurrying underfoot. Ach. Always bet on the bacteria!