Why does all new pop music sound the same?

As if the music you listened to when you were a teenager didn't sound that way to your grandparents.

I’m with @onhwy61 ...you could say that all genres of music sound the same, although, If you are a fan and follow certain genres you’d be able to pick out what makes it different. 

What I have heard the last 20 yrs does sound more similar to me than not. Which most all of that music is not my cup of joe to begin with. The you tube video seems to make sense.
People relate to things they are familiar with. In the past few decades people have probably been raised without a connection to original music, acoustic instrumentation, creative music, personal ability to play an instrument even simple ones. So maybe that is why they want to hear the same not very good thing over and over. Just my opinion. 

It sounds the same to all of you because you are OLD.  Don't you all remember your parents saying to you "all your music sounds the same".  Old people have been saying that to younger music fans since 1955. New music sounds different to young people.  Your grandmother couldn't tell the difference between Bob Dylan and Bobbie Sherman.  

Musical inbreeding, encouraged by the industry which is convinced that there's a formula based on recent trends.  But there's plenty of good off-mainstream stuff to hear if you do your homework and there's bound to be someone refreshing and good to come along sometime (probably not soon enough) who will be popular.