How long will Dance music last?

As you all know every artist is now trying to come out with dance music to appeal to the mainstream crowd. Most people think it is as phase and it will soon die down. Many artists have their main genre the came out with then they do a few pop/dance songs. For example Rihanna has a song named we Found Love it is a very up-tempo song with a lot of synthesizers in it as well. Rihanna main genre is R&B but all artists are doing what it takes to sell records and going mainstream. Another example is Chris Brown Turn Up the Music and Nicki Minaj “Starships”. Most people are saying that Nicki Minaj is a sell out and she should just stick with rapping. A couple of years ago reggae was the mainstream music that everybody was listening to and wanted to have in their mp3 players and radios. Only after about a year it died down and most artist were consider one hit wonders. What most artists are doing today is ver smart and its a skill you need to have in order to make money in the music industry as well as make a living and last in it. Today's artist have to make opportunity costs, which is the cost of an alternative that must be forgone in order to pursue a certain action. Basically, the benefits you could have received by taking an alternative action. The use their skills an make all type of genre music their original genre and do a little pop/dance just to get the crowd to buy their music.  Country is stated to be the most profitable genre in the music industry right now then Rock n Roll and after it would make sense to say Dance/pop. Dance and Pop is a genre that all crowds like no matter what the race is and it is something everyone can dance to. Pop is also well known and in demand around the world.