all those "Supposed" place holders
I'm not sold that they are temporary place holders. A lot of those are split between part time RSNs and HD PPVs. The need for that isn't going away anytime soon. As MLB ends, NHL and NBA will be starting up so those channels will continue to be split between PPV and part time RSNs.
And a number of channels will always remain HD PPV because D* makes a lot of money of PPV and they won't give that up.