The fact that even all this pro-R "unskewing" where we lazily assume that the same polling error occurs again AND to the same extent (which wasn’t the case in 2018) only yields a map where Biden is already at 278 EV is pretty devastating for Trump.
I don't think so. I think we might be at a crossroads for polling. In the same way the "New York Times" and major newspapers or late night TV like "The Tonight Show" are now essentially arms of the left, we may see polling join that group, especially if polls overestimate Biden like they did many Democrats since 2014.