There will come a time when Trump is not physically able to keep campaigning. You might not be rid of MAGA come that day, but Trump won't last forever.
Thank god he's old, then, because he's not going to last long enough to be long time dictator. But maybe thats not the point, even if trump is gone, if hardcore republicans dismantle elections to ensure they're perpetually in power, then who the current figurehead is will be the least of our problems