I won't buy any but I think it's a reasonable thing for them to do. Why add more "HD" channels with NO HD content. This is content people will want.
I disagree. I think there is more demand for a few hours of HD content a day from a USA, FX, TBS, Sci-Fi, etc. than for more HD PPV channels.
The only way I can figure this makes sense is if they are doing it to leverage underutilized bandwidth by time-sharing with the HD RSNs.