The reason they are upgrading to MPEG 4 is so they have the room to convert a lot of channels to HD. 1 standard def Mpeg 2 channel is 1/4th the size when encoded as Mpeg 4, and 1 HD channel in Mpeg 4 is about the same as a standard mpeg 2. So if every thing was converted to Mpeg 4 they could do...