Board Thread:Spoilers!/@comment-1916997-20160117070033/@comment-26159109-20160117161808

I found out what it actually mean:

http://tvtropes.org/pmwiki/pmwiki.php/Main/NetworkDecay

Or from Wikipedia:

network decay is the gradual shift of a  television network away from its original programming, to either target a newer and more profitable audience, or to broaden their viewership by including less niche programming. Often, this results in a shift from informative,  quality programmingaimed at the  high culture and educated viewers, toward sensational, ratings-based, and/or reality-TV programming designed solely for the entertainment of a mass audience. Channel drift frequently features the incorporation of  infotainment,  reality television, and/or heavy advertising into the channel's lineup.