One thing that will help that the total amount of traditional music available in recordings is higher than its been. Even if interest in the tradition wanes for a while, as long as there is a readily available source library, it will come back, as long as it is good. Look at the swing/ballroom dance revival. Be honest. Anybody out there who would have predicted 5 years ago that a mambo would be a top ten music video on MTV/VH1/MUCH.