I see two things in the data. First, in the early 2010s the car world woke up to what we already knew - that e9s are beautiful and functional and great fun. There began an upward trend in value that continues to this day.
The second thing I see in the data is a distinct bump around the time Covid hit. I have a friend who is in the guitar business and they saw a huge jump in sales during Covid (and sales are now coming back to earth). I think a good deal of the stimulus money that was pumped into our economy went to luxury items, including classic cars. If you take out the Covid bump, our cars are about where they should be based on trends for the past 15 years.
I have several friends locally who bought the muscle cars of their dreams. They still evoke fond memories, but unless you are into drag racing from stop light to stop light, the driving experience leaves a lot to be desired. Most of these guys can't get their wives into their cars, which drastically cuts back on their usage. I think they are not going to hold up once the people who connect them with fond memories of their youth reach the end of the road.
Our cars remain enjoyable to drive. This fact, coupled with timeless beauty, leads me to believe our cars will hold up pretty well.