I'm unsure, if no other major disasters occur under his watch then people might forget about this whole thing. Bush was hated for me most of his second term cause the forever war in the Middle East was constant throughout his term, so everyone could point to that and bitch about it. Biden can just point to the fact that he was the one that got out of that hell hole and point to Trump for making a bad deal or the ANA for being cowardly bitches that just rolled over for the Taliban.
Of course, as Obama said never underestimate Joe's ability to fuck shit up. I'm fairly convinced that this is just the first in a line of failures, but I'm feeling that this might be the most significant cause of just how bad it turned out. The comparison pics to Saigon alone are gonna be tied to him in the history books forever.