There isn't much evidence that EDM is much more than a passing fad, either. Rock music has held fairly strong on over the past 60-70 years and has been able to accommodate and integrate fads, shed them, and then reincorporate them in throwback form.
70s glam rock gave way to 80s emo synths. Grunge brought things back into simple form, which gave way to the rap/rock craze that then gave in to the Stokes, White Stripes, etc.
We're now at a point where music incorportes a lot of ideas and those ideas don't fit into the molds we are used to seeing. A lot of those molds still have guitars as a key ingredient and live music is as popular as it's ever been.
You never can tell how long a fad will last, but to be fair, EDM aka House aka Techno has been around in one form or another since the late 80's or early 90's depending on who you ask. That's almost 30 years right there.
70s glam rock gave way to 80s emo synths. Grunge brought things back into simple form, which gave way to the rap/rock craze that then gave in to the Stokes, White Stripes, etc.
We're now at a point where music incorportes a lot of ideas and those ideas don't fit into the molds we are used to seeing. A lot of those molds still have guitars as a key ingredient and live music is as popular as it's ever been.