Agree with this. The irony in this, of course, is that most of the instruments used on our favourite records weren't vintage at all. A '59 Les Paul was 10 years old when Led Zep 1 was released. The Strat Hendrix played at Woodstock was 1 at the time. Jaco's iconic '62 jazz was just a teenager when he recorded his debut album, etc.
I think there is magic in some old instruments, and it doesn't really matter whether it's almost entirely psychological. Perhaps it's the price and how inflated they all seem, even compared to a few years ago.
Or maybe I'm still the person who remembers a Mars bar costing 25p and is upset they're now 80p (or whatever they cost). This will play a big part in it I'm sure. (It's certainly not envy, because I've owned them and could own them now if I wanted to.)