Yes, I think he'll last for his entire term and then be gone.
However, this second term of his will have lasting damage that'll take years to reverse and recover.
See, it's not so much about him being physically in the White House in power; it's about the everlasting impact and influence of his brand of politics and rhetoric that's become ingrained without a sector of society.
I'm not going to buy into this 3rd term, dictator, or no more elections doomsday angle some are pushing, I don't see any of that happening; the reality is that Trump's MAGA impact and influence on politics, politicians, and voters, specifically of the conservative ilk, will be here for many years after he's gone which will take time for that to change.
I will say that this MAGA era of politics won't be eternal as some think, for now, sure, but in decades from now, say 30-50+ years, this will just be another chapter in America's neverending political saga. Politics goes through changes, nothing stays the same because society is always changing.