The sell on Biden is a) that he was Obama's VP and b) that he isn't Trump. It's more of a negative sell rather than a positive one and Biden is going to have to run a very negative campaign in order to win, because all he really has to talk about is how bad Trump is (and there's a lot to talk about there!). The president actually has a record to be criticized on now. But on the other hand, Biden has a very long and mixed record himself to be attacked on. Some of it is going to really hurt, like the race stuff, and support for cutting the social services.
This is just a bad outcome for the country in general. It's unfortunate. Both presidential campaigns will spend over a billion dollars, mostly on attack ads. The debates are going to be entertaining though so there's that.
I agree, I guess Joe's plan will be to attack Trump and get an anti-Trump surge. But with Joe's history, the attacks back on him will also be really easy, and laser focused on voter suppression, they will target AA (his segregation/crime history), young people (m4a, war, and climate change), and Latinos (massive deportation numbers under Obama, starting the detention camps).
I don't doubt the fact, that there's a real surge of anti-Trump democrat voters. But the data shows that Joe's surge numbers come from a base that already turns out to vote no matter what. They are AA, and older voters. AA overwhelmingly vote democrat, older voters consistently turn out to vote in high numbers, these things are constant. The real turn outs Joe needs to beat Trump, has to come from white/middle to lower class voters, from younger voters, and from Latino voters (Hillary had overwhelming Latino support in her pocket). How many in those demographics will feel like Joe will change enough for them to get them out to vote.