I dunno, at this point - as always - the person most singly damaging to Trump’s brand is the man himself. His people don’t worship him so much as the ideals that he represents. They KNOW who he is, they simply do not care. And if he died, they would just move on to the next one - we thought DeSantis but similarly to Trump himself, his own shortcomings got in the way, and unlucky for him Trump did not step back + he (DeSantis) simply could not force the issue on his own.
And unfortunately, there is a lot of truth to the idea that the Democrats suck ass. If the question is “what is 1+1=?”, the Dems answer is a million, whereas the old-school (e.g. Tea Party) Repubs answer was negative Pluto, while the Alt Right would fuck your mom and kill your dog (or maybe get them confused and vice versa). i.e. there are a lot of ways to be wrong, but they are not equally so.
His conservative base is not nearly so “Pro-Trump” as they are “anti-libtards”. Which should worry us all, b/c McCartyism has touched this nation before, and those who do not know their history are doomed to repeat it. Anyway, yeah they would move on, and yeah those others would not be supported quite as strongly, but I don’t think this would actually matter, in terms of people showing up to vote to swing an election? If anything, it could even help Repubs chances, for those middle-of-the-road voters who definitely do not want to vote for Biden yet did not want to vote for Trump, and would consider voting for a different Republican.