I am taking my son skiing for the first time (he is only four) in January and we have been watching some of the skiing on Universal Sports so he can understand what it is he is supposed to be doing, since he won't be seeing any snow around here. Universal Sports is a great idea for a sub channel because it carries programming that gets very little coverage on other channels, including the cable channels. I don't imagine it gets very high ratings but it certainly is welcome over an infomercial channel.
I would expect that Comcast would find a way to still carry Universal Sports if Channel; 39 drops it since Comcast is taking over NBC Universal and I would think they would want to keep their network on the air in Houston. KIAH may be putting Antenna TV on 39.2 thinking that Comcast will carry it at the slot already used for 39.2 on cable, and add an extra slot of 39.3 on Comcast to carry Universal Sports. The carriage of some of the subchannels by Comcast (2.2, 2.3, 8.2, 8.3, 11.2, 13.2, 13.3, 39.2 are on Comcast in Houston) is one of the main reasons I subscribe to Comcast instead of AT&T U-verse in the first place. I don't think AT&T offers any of the subchannels.
On another note, I wonder when Fox will offer any subchannels on KRIV 26 or KTXH 20.