Hiden' Biden's ONLY hope is to literally stay in his basement until the election, and find anything close to a legitimate reason not to debate president Trump. I don't know he can pull off the latter, since he's already agreed to three debates.
My only fear is that Trump will let him have it with all four Trump barrels, and people will somehow consider it elder abuse. If Trump can ease off, and let Biden's own words do him in, then no worries.