Everyone is going to look pretty silly on this subject after Biden is renominated.
Furthermore, the Democrat/Communist Party won't be able to cheat their way into a Biden second term as, for all their normal fecklessness, the GOP is onto them and, as importantly, the Democrat/Communist leaders certainly know they won't be able to neutralize the growing number of their base who, although they certainly won't vote for Trump, will instead likely sit out the election. That number is likely to be far too large to overcome by cheating.
So, no; I don't believe for a hot second that Eff-Joe Biden -- even if he is awareded the nomination by Democrat/Communist Party leaders early on -- will remain the nominee as we approach November.
Is Kamala the veep?
What if Biden falls into a Francisco Franco (comatose) state before the election?