I've said this before - with all these channels like FX, USA, Sci-Fi, it doesn't matter that a small percentage of their programming is in HD or that they do horrible stretch-o-vision (TNT and TBS I'm lookng at you).
We need the HD version because all of their *original* programming is in HD and will be from now on. On FX that means Nip/Tuck, The Shield, Damages, Dirt, etc. I don't care what they're doing the rest of the time - I don't watch any of those channels anytime else. If I wanted to watch, what's it called, The Frank Show on TBS or anything else that's original, it would be in HD, and that's reason enough to have TBS in HD.