The only real question is how many people will show up solely to vote against Trump

Those who are enthusiastic for Trump were always going to vote, and those who are voting strongly against the left's ideology tend to be those who are heavily invested in politics and consistently vote as well. Those who are voting purely out of enthusiasm for Biden are small enough in number as to not be particularly meaningful, and those who are voting strongly against the right's ideology tend to be those who are heavily invested in politics and consistently vote as well. Both groups have ideologues who blindly and strongly support their own ideologies above candidates or the opposition's views, and these groups vote consistently as well.

Now, very few people are voting because they hate Joe Biden the person. They may hate what he represents, the ideology he is the figurehead for, but that group is discussed above and generally votes consistently. Very few people who are typically indifferent to politics are going to come out to vote against Joe Biden.

So the real question is, how many people who otherwise would not vote will come out to vote against Donald Trump the person. Is there enough hatred among those NOT normally heavily invested in the left's ideology or strongly against the right's ideology to have a meaningful impact at the ballots? Will the disdain for Trump in the national polls be reflected at the ballot, which would require many to vote on that hatred alone?

That is really the only question, because Biden needs that contingent. If that contingent half asses it and doesn't back up their talk with their votes, he will not win. Hillary was divisive, but many did turn out to vote for the "first female President". She did have a cult of personality around her. Biden does not have that, and he will not win because people are turning out for him more than they did for Hillary. He needs people turning out against Trump to not only make up the difference but push him farther than enthusiasm for Hillary pushed her.