I think this is a bit of revisionist history- A&E used to show 25 hours a day of "Murder, She Wrote"- and MTV and all the others have always aired crap alongside music videos, etc. People tend to forget this- but shows like "Remote Control" and "Lip Service" were far from quality fare.
At the end of the day, these are businesses and their model only works if they attract eyeballs and then advertisers. If there was demand for X, then these channels would show X. However, the demand isn't there, so they evolve.
At the end of the day, these are businesses and their model only works if they attract eyeballs and then advertisers. If there was demand for X, then these channels would show X. However, the demand isn't there, so they evolve.