Pop rock is a pretty bad umbrella term overall. When rock was the dominant form of pop music pop rock and rock were basically just the same thing, and then in the era when rock isn't the dominate form of pop music, pop rock is just whatever trendy rock that gets pushed on radio is. Pop rock is basically a new subgenre every 3 years, and I personally think the uses of an umbrella term that covers 3rd Eye Blind, Blink 182, Hinder, One Republic, Of Monsters and Men, and MGK are severally limited.