I think last summers "over crowding" is "over stated" As mentioned, with public parks shut down or on reduced capacity, there may have been some artificial high capacity but nothing outrageous. We've had no issues getting sites.
I think it will be 2022 before we see if people who bought last year start selling in large numbers.
Of course, I think by the end of March, we will see restrictions settle down and restrictions largely ending. Something like 90% of the deaths are in the 65 and older group...after first responders, that's the next big group. Once they are vaccinated, expect deaths to tail off drastically. It will be a bit slower, but with estimates of around 80-100mil having already had plus another 100mil getting vaccinated by March, expect the early stages of herd immunity to kick in with infections tailing downward...You might see some minor restrictions kept in place but very quickly, it will be a tough political sell to keep businesses closed.