I have talked to a few guys in the know. One guy is the go to for certifying classic and rare Jaguars. He has talked at conferences with Wayne Carrrini, and other collectors. He has voiced his displeasure with the imports of the 90's taking center stage all of a sudden in Hagerty's public forum. While it may be hard to gauge how long classic cars may be relevant, their longevity had ebbed and flowed through the decades. There has always been newer cars available, and street rods/resto mods is not a new phenomena. If we look at the Model T, and the enthusiasts who built and followed them, they are definitely long in the tooth, but a new generation has somewhat taken the mantle and rat rods them, while others like purchasing a stock running and driving T. While new motorcycles sales may be down, classic bikes have been on an upward trend for some time now. Hagerty may not acknowledge this, but they are a bit lackluster in certain areas.
So what I am trying to say, is while you can use real data from BJ, and Hagerty quotes, I do not think they define the larger picture, and in fact are more the fringe. If Art collectors have moved on from classic cars, and ridding the high times of muscle cars, and looking for the next big thing.
I have no problem with that, but Hagerty, Craig J, & Dana Mecum may not be thrilled that their higher tier of clients may be on the downward spiral. It is cyclical.
Its not going to stop me from collecting and enjoying cars though, since I have fun regardless of the values.