From what I've seen this year over last, I think that they have stabilized. I don't think that I can replace mine for what I paid for it, but the difference isn't huge. And I think that a lot of us think of them as future collectibles when we do buy them, but again, not in my lifetime. Ours is a summer car and gets garaged for the winter, so with normal maintenance it should last a very long time. As long as the other drivers around us are paying attention, anyway.
So enjoy yours as much as you can while you can. It likely won't make much difference in the long run. And they are very enjoyable!