I suspect you will see more and more non-MAGAs retiring before the election, and those will be replaced with more extreme versions. The Republican Party has been on life support for a while, but I think the part, as it was, is dead. That's not to say it will not see more success given the polarization and gerrymandering of our districts, but the old GOP is gone. I don't see it coming back even when Trump is gone.
The Old Old Gop has always been right wing, and populist. You ever heard of Robert Taft ? John Bricker ?
Rockefeller, Eisenhower, and in many ways, Reagan were exceptions.