I don't know if there was a problem with EDM, when one looks at how the music industry itself fared with it. When EDM pop was hot in the early 2010s the music industry was still making considerable money despite the fact that the recession was still a factor until mid-decade.
In fact, from 2006 to 2015, according to the RIAA, it was the time that the music industry had the highest number of "units sold" (mostly MP3 download sales) in the industry's history -- 1.4 billion units sold in 2012 alone.
So the music itself was indeed popular, and people thought it good enough to buy it. Of course, thanks to the ITunes, individual song download phenomenon, album sales dropped, and correspondingly the revenues weren't as great as they would have been had the album sales model not been shoved further and further into the background.
But trends happen.
But would TSL also have been low because of streaming's increase in popularity? By 2015, streaming was half of the music consumption, according to the RIAA. How this interpolates with radio listening isn't dealt with on their graphs.
But streaming's popularity more than quadrupled between 2011 and 2016. I'm sure that may have affected radio.
It wouldn't affect the public's taste in style of music, though. I think EDM just lost popularity in 2015 for the same reason disco did in 1980 -- people's tastes changed.