There are a lot of good reasons to not want Biden or Trump to run. I don't think that translates in how the vote pans out regardless.
Hasn't gotten any better, either. Landlines are still far too over-represented.
Don't get me wrong, there are a lot of other candidates I'd prefer to BIden as well, I just think you're getting too far ahead of yourself.
Polling is getting better, and methods are changing. Only 10% of pollsters are using land-line alone now. And regardless, in 2016 and 2020 the polls understated R support. So if anything, this trend in swing states could be even worse than it looks
https://www.pewresearch.org/methods/2023/04/19/how-public-polling-has-changed-in-the-21st-century/