Ugh, enough with this "MTV doesn't play music" argument. It's not fiscally feasible anymore to simply air music videos. They're all on demand online now anyways.
Showing videos brings in no revenue. Why would Viacomm not change programming to its current state?
Besides do you really want MTV to show videos? Everyone always made fun of them for being out of touch/lame when they did (even in the 80s). Besides you can now watch ANY video on demand. Whats better than that?
Besides exposing people to new artists, what other benefit would MTV airing videos have?