The demographic and ideological end of the Republican party has been predicted for a long time (I recall reading about it in 2003 ish, as well as essentially the same argument being made in 2019 by some ex-HRC campaign staffer conservative type). It has been wrong for almost 20 years, and will continue to be wrong, because it doesn’t account for the gerrymandering and voter disenfranchisement (tuned quantitatively to the electoral college geography) that is the fundamental strategy of the Republican party.
“Oh, more latinos/hispanics in the future voter generations? Let’s pass some laws, gerrymander and dilute their vote.”
“Black voting participation rates are increasing, in spite of existing laws meant to deprive them? Let’s “georgia” them out of importance like we did to Stacey Abrams.”