You may be taking an American-centric view of this.
In Europe, metal (and it's many sub-genres) is frickin' huge, but most Americans haven't even heard of most of the bands.
I started getting into symphonic metal about 6 years ago. Only a few of those bands ever play in North America.
As far as we in America are concerned, all that pop garbage really is taking over radio & the charts, which makes me very happy I found other music to discover.
I think as long as you make yourself aware of other kinds of music, you can find something you like and never have to listen to the radio again (unless it's Sirius/XM, that kicks a$$).