A fancy new trailer sounds fun. But the family memories of sightseeing, trail hiking, and camping together will be much the same with the old trailer as with a new one. When you say "expandable," do you now have a popup or is it a hybrid (tent ends but otherwise hard-sided)? What is its length? Although tent material knocks a few campgrounds off the list due to bear-related prohibitions, the vast majority of locations would still be possibilities to you.
Keep in mind that a new TT will be off-gassing for the first 6 months or so, and these chemicals can make some people's eyes water. If you're buying used, this won't be an issue... but then you'd need to be eagle-eyed when inspecting for possible water damage.
My guess is that prices will still be high all this year, but by 2022 we may start to see some changes as new RVers decide to move on to some new, more exciting hobby.