mmm...difficult one, the thing is there are loads of young people (17-30) who are well into the Rock n Roll / Rockabilly scence and paying high prices for rare Rock n Roll records, i've seen 'em at record fairs and the such in their heavy denim jeans, leather jackets and quiffs! the same will be said for Northern Soul records, lets face it, our kids know that they're valuable even if they don't particluarly care at the moment (they will do when we croak it and they think there's some mullah to be made that's for sure!).
I've talked about this many times with friends and I still think there will be a Soul scene of some sort in another 30/40 years...it'd be interesting what other people think.
One thing's for sure, the 60's especially will always be a very collectable era with oldies and youngsters alike...some see as the epitome of music.
Meanwhile, here's one to ponder...is swing, jazz etc from the 1940's still collectable? Perhaps all the o.a.p's can't afford them on their pensions!