Honest question, would that even matter? I feel like someone that is so extremely polarising would have a very low martyrdom effect. His followers are basically already cult like, it's hard to imagine them being more loyal or radical than they already are, and people that aren't his followers probably wouldn't be moved to the right by his death.
Like if he died in the shooting, do you really think things would be worse right now?
Except from what I've seen he actually is willing to listen to experts with stuff like that. He doesn't care about being right, that's why he constantly lies and let's himself be proven wrong 50,000 times. He only cares about doing what he believes will benefit him, and listening to doctors to save his life benefits him.