He specifically has energized a largely previously untapped demographic. When he finally has the grabber than nearly 8 decades of fast food and amphetamine usage has earned him, you’ll definitely see a mad scramble to fill the void- including some that I’m sure will copy as much as they can of his temperament and mannerisms. But no one is going to have the same cult of personality. Don Jr? No. Guyliner Vance? No. Desantis? No. Republicans will still loudly support whoever is next, but the New MAGA will largely become bored and disaffected.