The ONLY reason Biten Quid Pro Joe stays in this race is due to the false narrative that it INOCULATES HIM AND HUNTER from being investigated by Team Trump over their CRIMES in Ukraine!
OK, I'll play along...
So he drops out due to running out of other people's money to run on, or is so roundly rejected by voters, or whatever.
Next scene, he's arrested on blackmail/bribery charges.
You're his lawyer, do you try to get him declared incompetent to stand trial?
I bet any shrink could in good conscience certify that he doesn't have testamentary capacity...