With most of these Triumphs there remains a healthy number available for restoration. For example, just look at eBay (or any of the usual LBC sales venues): you can find a TR-3, 4, 6, 7 or 8 any day of the week for sale, in various states of repair, and Spitfires are a dime a dozen. Aftermarket and OEM parts are readily available for most of these models, and more.
But, what about the future, the next 10-20 years?
Predicting future demand for Triumphs is a crapshoot. However, look at big Healeys as an example: in 1980, who woulda thunk they'd be selling for $65,000 today! Maybe some Triumph models will hold and increase in value similarly. Maybe not.
It's all about demand, and demand remains high for now. When the current generation of collectors (us) goes, demand may fall off a bit, but there's always a market for nice antique cars.
Also, look at the significant investment aftermarket vendors are making, with Moss building a HUGE multi-million parts distribution facility just down the road from me. Such investment indicates strong confidence in the future of our market, and is a positive indicator of the future value of these cars.
At any rate, a very interesting exhibit, Scott. Thanks for posting that. And, everyone hang on to your Triumphs: I predict they're gonna hit the ceiling in the next 20 years, value-wise!