Let's travel back to the years 1988-1994. A popular "boyband" that was once considered to earn more than Michael Jackson and Madonna ran it's course in the world music scene. Yes, the band was New Kids on the Block. Yes, a lot of what earned them a spot on Forbes' list, was the merchandising and endorsements as well as the music that was produced at the time. However, their break into the music scene was not met with open arms, and if it wasn't for a radio station DJ playing one of their records on a different demographic than they originally intended, they might have never happened.
Let's fast forward to present day. The years 2009-2014. Another popular "boyband" recently announced that they are going to take a break after their what was originally called a "World Tour", but reduced after dates were cancelled. All members stating they have solo projects, and life goals they want to accomplish just like the band mentioned above. Yes, the band is The Wanted. Some maybe celebrating and rejoicing just as many did back in the day, but fans are seemingly devastated. Of course, as history has taught, life does go on, and perhaps that band can make a comeback someday.
As you can see from the years listed, their longevity was really short in the grand scheme of things. Today (January 28, 2014), Motley Crue held a "press conference" on their website announcing their upcoming tour is going to be their last. Those who consider themselves a realist might claim this as a way to sell more records and tour tickets. Time will tell. Yet, when comparing this rock band to the bands mentioned above they have had a much longer career in the music business. Could it be that they took "breaks" without formally announcing them? Could it be that the genre of music they represent can withstand the chaos and demand? All valid questions, but all have loyal fans as well as maybe some of the same fans. Loyalty can only do so much as these examples have proven.
In terms of genre vs. longevity originally tested, it seems what is popular isn't always in the "pop" genre. Feel free to add your thoughts on the subject in the comments!