Allow me to trot out my Trump/GOP voter/Cadillac owner analogy.
Many years ago, Cadillac did an analysis of their customer base. The good news: Their customers were extremely loyal. People who bought Cadillacs traded them in for new Cadillacs. Incredibly strong brand loyalty.
The bad news was that they weren't attracting any younger drivers, who were flocking to German, Swedish and Japanese luxocars. Cadillacs were for blue haired ladies playing mah jong and the guys at the country club who spent more time playing gin rummy than golfing. It was an old man's car from a time when luxury meant you were isolated from the road. Cadillac did that by removing all connection to the road. The steering and brakes were numb.
Since that time, apart from a few bombs like the Catera and gawdawful
Cimarron, Cadillac has been transitioning quite nicely to cars that appeal to younger sensibilities.
The Trump/GOP is in a similar situation to Cadillac. They have a fanatically loyal customer base. It doesn't matter the quality, they keep coming back and buying more. The problem is their customer base is old and white, and they are not replacing their seniors with incoming juniors. The GOP is not attracting young voters, nor is it attracting minority voters.
Whereas Cadillac could still offer a Fleetwood while making an ATS, the Republican Party has a harder time trying to please their base while attracting new customers. Especially if the Republicans lose the House and the Senate this fall, you are going to see some intra-party rebellion happening between the pragmatic moderates and the ideological purists. So the big question remains for the GOP: How do they attract younger voters and voters of color without alienating their aging white base?