Now that most of the world has gotten back to living like they were pre-2020, things are changing. Since people can again go to plays, concerts, movies, and church, there's a lot of people who haven't gotten back to the outdoor activities.
With that in mind, tents probably did reach market saturation - at least at a particular price point. There are a lot of gently-used tents on the market now, although most sellers seem to be depreciating from the bloated pandemic pricing they paid, rather than where the market is now.
For those waiting for new rooftop tent prices to come back down a bit, that's now. Tuff Stuff Overland had a basic 2-person tent that was going on sale for $650 in 2019. Right now it's $850, which is what I paid for my Smittybilt back in 2015. With the massive inflation we've had over the last couple of years, this is probably the bottom dollar, and a good time to buy.
The whole trend is far from over. The designs have evolved from soft clamshells and fiberglass pop-ups to speedy wedges and massive 3+ person hybrids. More people than ever have discovered the luxury and convenience of having your lightweight but bulky bedding and tent all stored securely overhead.
3 vehicles, 8 years, and 200 nights, it has been a fantastic purchase.