Lots of networks have drifted from what their names indicated. The Discovery Channel and The Science Channel have very little science anymore. Lots of networks have drifted so far from what they were originally named for that they've changed their names -- Arts & Entertainment is now just A&E, The Nashville Network became TNN and then SpikeTV!, CourtTV is now the "reality"-based TruTV, and so on.
The problem is that they're commercial networks and are thus dependent on ad revenues to stay in business, and that means they can't stick with specialized niche programming but have all had to drift toward more generic, popular stuff in order to get the advertising dollars they need. It's only premium channels and commercial-free public television that are really able to maintain niche identities.