It's popular in T v because it get a lot of people out on the dance floor. If one dance with some energy, it's a good aerobic workout.
Like the good book say, "use it or lose it".
Dancing forms have changed many times thru the years. From the thirties with ballroom dancing, to the big band era type dancing, Rockn - roll, to the "do your own thing" era, street dancing, and now line dancing. It is what it is.
A know several people who love dancing when you had a partner in your arms, like in the Fred and Ginger days. We will never see they're likes again.
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"It doesn't cost "nuttin", to be nice". 
MOM
I just want to do the right thing! Uncle Joe, (my hero).