Most of the data/science shows within 6 feet for >15 minutes is the sharp end of the curve for when you get COVID. Most planes are well under that and air is refreshed every ~3 minutes.
Driving isn't without COVID risk either, you have to sleep somewhere, eat somewhere, go to the bathroom, wash yourself, and maybe do laundry at some point.
So compare the two probabilities of getting COVID on your Ouija board, multiply times the chance of dying or having a lifelong condition, and then add the probability of dying/being maimed in a car accident over the course of 4000 interstate miles in the winter, even on a southerly route. Flying is cheaper than driving at this point.
If you're worried about the risk maybe just stay home and get the vaccine and fly later.
I think the economy will be the economy, the biggest crisis is interest rate based. Houses are purchased based on monthly payments (ie people will buy what they can afford), as such a house in Seattle that was $500k is now $750k or more. most of that can be attributed to interest rates. They can't go too much lower, but if they go up, plenty will be underwater quick even with a 20% downpayment.
Boat prices I would expect to have their inflection at typical storage/splash times. I don't think when boats come out of storage this year COVID will be under control, so boats will be popular this summer again. Maybe the fall haul out will scare some folks off? Maybe the March 2021 splash and finding moorage will end it. Keep in mind there is still no clear path to an approved vaccine for those under 16, that may be late 2021 or even 2022 before we see that. Are the Jones' going to go on the international vacation with only the parents inoculated? They may hang on for a while. How much is every missed season worth to you?
The greatest economic pressure may be inflation, which would counteract the Jones' selloff of their naval fleet.
Finally, if you haven't realized. Boating is horrible financial decision. So don't do what you can't afford. But if you want to do it, and find the right boat at the right price, don't wait.