Yeah... not too long ago we had separate forums for the top 5 cable companies, and they were mostly like ghost towns... so we decided to consolidate that back down to just one Cable TV forum.
When a channel goes away, it is either provider-specific (goes in that provider forum) or is channel-specific and we have general TV forums for that scenario.
About the only situation we don't have a clean place for... are mergers... like the ATT/DirecTV one. Discussion of that is important to DirecTV customers as well as ATT U-Verse customers... but that's really the rare situation. The recent cable mergers (or attempts) go cleanly in the Cable TV forum since they are just Comcast/Time Warner or Charter/Bright House/Time Warner.
Full disclosure... I pushed for the top-5 cable company forums (I wasn't alone) when we expanded this site not to long ago to cover the broader DBS content. I used the argument from Field of Dreams (build it and they will come)... only, I was proven wrong... we built it, and they did not come... at least not in enough quantity to warrant having the diluted sections for each of them.
So now I've fallen back with the experienced folk here who kind of saw that coming... and usually wait for there to be real demand for a new forum before going about creating one.