Maybe from straight actuarial tables, but those don't take into account Trump's incredible wealth, immediate access to the greatest doctors in the world, nor the fact that his parents lived until 88 & 93 years old.
Edit: actually, even actuarial tables give a 78 year old a 50% chance of living another 9 years.
If I were one of such doctors, I'd stay the hell away. Apart from the reputational damage of helping someone who advocated for injecting bleach, there is the fact that they just won't get paid. Trump stiffs all his contractors.
I don't think he's going to die in office (which wouldn't help much anyway; if anything, it would mean "instant canonisation" and weeks of TV programs extolling his virtues). I think it's sad that this is where most of the thinking population of the US is: hoping for the old dictator to die, like some African or South American backwater.
Edit: actually, even actuarial tables give a 78 year old a 50% chance of living another 9 years.