It's not that they are benignly ignoring the wage earning working class (150 million + voters). No, they are doing more than that, they are anti worker.
As you say, the number of Americans who actually like the Bush/neocon wing of the GOP is small, but as long as they were or are able to present themselves as the only electable alternative to liberal Democrats, most conservatives are willing to vote for them as the lesser of two evils.
No doubt they will still be around long after Trump leaves the White House, but I'm convinced that there will be nationalist, populist candidates in the mold of Trump to challenge Bush Republicans in the primaries, because Republican voters have come to expect that alternative.
I guess we'll find out if that's true in the 2024 election.