Transition period toward a progressive era. I think if elected his presidency would easily be overlooked. Forgettable, but much better than the four year long reality tv show we've seen. Currently already exceeded expectations.
On the contrary, Presidents are ultimately judged on the basis of their results, so if Biden wins & actually manages to achieve &/or even just pave the way toward real progressive change, then he could very well end up being remembered by future generations as a hugely successful progressive icon.