If he survives.
I know that he's looked like death warmed over for the last ten years and yet is still alive, but he's an old man with a pathologically bad diet who is under extreme stress.
If he lives, even if he's arrested, I believe he will be the nominee. However, I don't believe he will win the Presidency if he is jailed. Americans like powerful, successful people.
It's a shame the Democrats are also one health incident or even scare away from losing the race. In any other country, or in America before the twenty-first century, selecting a different, non-moribund candidate would be almost automatic.
Man, I really won't watch a Trump/Biden debate, where Trump will scream and Biden be feeble.