Seeing as all songs had to be under 3 and a half minutes in the late 80s or a DJ would start talking over the end (leading some on PJ to invent the "3 minutes 27 seconds is the ideal song length" theory), it's just a gradual trend that's got songs shorter and more immediate.
I don't think we'll ever get some of the mega-length songs of the 70s and 80s back.
dddd Blame It On The Beat is like... my super secret bop. I put it on at random times at a party/or on a drive or whatever, and whoever I'm with is always left snatched bald. People just don't know the history!