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Hopefully Rumba will continue to grow in popularity as you seem to indicate. But it is hardly a mainstream dance even in Cuba, never mind any where else in the world.
That was kinda my point, that it's not practical as your primary social dance.
Rumba is absolutely a mainstream dance in Cuba -- in certain social and racial circles and locations. Comparatively well-off whites don't dance it much. It's not danced much in clubs except as part of casino. So most tourists don't see much rumba except as part of performances. But it is danced socially _all the time_ in neighborhoods and solares all over the country. Many of my friends grew up dancing rumba every day and they still do when they go home. Many neighborhoods you only need show up with a bottle of Havana Club and say -- hey, can we get a rumba together -- and 5 minutes later you'll have people in the street with congas, bongos, claves, everything you need, and off you go. Not a show at all, just people dancing and having fun together (although, as timberamayor points out, there is often a bit of a show-off aspect to it).
Yes, shock, I'm doing a flyby visit, this place is still batsh.t crazy 