I’m not so sure about a glut of used ones. Manufacturers are working overtime to build new ones and are having issues getting parts and workers. It may turnout there may be a glut of new ones going unsold. I was told by Newmar when I wanted to replace the **** FlexSteel furniture they could not offer an estimate as the new supplier is so backlogged meeting existing orders they won’t consider making non warranty replacement units.
It could also be we are seeing a significant shift in work environments. Many companies and workers alike have found out two things. One they can get by with fewer workers although some have gone a bit overboard (perhaps not by choice). Two, if people can work from home they can work anywhere. Add in more and faster buildout of nationwide 5G and little need to go into office. Major cities will feel the impact first.
Add into that the current climate of workers being paid not to work, is putting pressure on small and medium businesses to modernize and automate. I’ve seen many chain restaurants building new facilities with drive thru / takeout only.
A lot of people are distressed with the whole public school system now and pulling their kids out to either place them in private/parochial schools or home school. The latter being far better option than Zoom classes. As RVers oft say my home is where I park it.
And lastly current and potentially longer lasting inflation making cost of regular houses unaffordable for many or most will force some to opt for an RV as their permanent abode.
Just my thoughts, YMMV.