Read it again: he said music, not jazz. Anyway, (e.g.) square dancing is still fun :-) And I know a few drummers would like to have a word with you about "instruments of a bygone era."
I should clarify that by "instruments of a bygone era", I really mean "acoustic instruments speaking the language of bebop, swing, etc."
While I agree that square dancing and other folk dance traditions can be fun, they can not by any means be considered "contemporary". Their appeal these days is that of nostalgia and fondness for these bygone eras.
As a 19-year-old who plays for contradances (a folk dance tradition from New England) and scottish country dances, it's hard to believe that the diverse crowds of teenagers, kids and adults of all ages are there because of nostalgia. The same is true of swing, lindy and blues dances I've been to: many people do genuinely enjoy these dance forms for themselves. All that's old is not irrelevant. Not everybody wants to flail there arms around in a sweaty club to electronic noise.
There is a real appeal to this music and these dance forms. Perhaps the biggest problem they face is that they're less accessible. Anybody can go to a dance party and dance, but you have to learn to swing dance.
While I agree that square dancing and other folk dance traditions can be fun, they can not by any means be considered "contemporary". Their appeal these days is that of nostalgia and fondness for these bygone eras.