Taylor Swift, for example... probably the most popular female singer in history, and I swear, she only sings one song over and over and over again. And nobody seems to notice or care.
Well, someone cares obviously, she has a lot of fans. I used to work in a place where the only radio station that would come in was a country station, and I heard a lot of early Taylor Swift on there, from when she was still a country singer.
In any case, I don't think kids today care about music as much as we did when we were younger. Now they have a lot of other things to pass the time with - social media, the internet, streaming, hundreds of TV channels, etc.