[But these are based on polls, not the actual election numbers coming in. Pollsters are out of their element on this, as we are already in the middle of the election. IDK]
https://fivethirtyeight.com/features/how-much-can-obama-help-biden-in-2020/
Then again, it’s easier than ever to avoid pollsters. If Trump wins, their reputations will take a beating. But the need for polls will never go way. Politicians need to know where they stand, where. And unlike Procter and Gamble, they only get true sales data on Election Day every year or so, and incomplete and/or tangential data (to their specific candidacies), at that.
Polling won’t die. It will just become increasingly inaccurate, as people find ways to avoid it, as they avoid ads on the internet, or on TV.
I don't think they are worried about that. Their primary job is push-polling. Push-polling by its very nature is inaccurate because its goal is to form opinions rather than gauge them. If they are really, really successful in their push-polling, their over all result can have a degree of accuracy.