According to the sales of RV's in our area, I would say there would be lots of used RV's whenever things become safer - vaccine, or whatever. Dh & I have also been talking about this. One salesman here said 'newbies' are coming in and buying basically whatever is left on the lot. We see a scant supply, especially trailers, of most of the RV dealers/lots here - they were crammed for the new camping year before April. We have never seen sales like this, so our thinking is that many will not stick with it.
Sadly, a lot of families have no idea what they are getting into, as a pp mentioned, unless you love and are committed to the lifestyle, it's lots of work and expense. The work does tend to lessen with experience - we have very little with our mh - but the maintenance, ins. taxes, etc. remain. It's not exactly a 'low cost' way to travel. We have loved it for many years and haven't stayed in hotels for so long we wouldn't know how to act, lol - we must have our own private baths and beds.
Also, it's scary to us think of so many basically 'spur of the moment newbies' on the roads towing, and many not thinking/or aware of the dynamics between their tow vehicle and their trailers. Hope they learn before disasters.