Heh, no DD-Lite.
Honestly, I do understand that with some good equipment you can hear the difference, IF, the source material was encoded at the same bitrate and not converted along the way. This becomes very evident on TNT-HD when they show older syndicated shows or old movies compared to say LOTR or Matrix. Obviously the movies were encoded much better with newer technologies. I don't think it had as much to do with TNT's higher bitrate though as the better source to begin with.
As for higher bitrate equaling better audio... I don't agree. Much more has to do with the soundmix engineering then the audio bitrate. Also involved are the studios that release the DVD's. Universal Studio's DVD's have on average some of the worst audio I have heard, but those disc's are packed with extras usually. While Warner Bros have some outstanding audio, almost to the point that it is hard to discern the difference between the DD and DTS tracks. What is also obvious is when certain disc audio tracks are encoded form a transfer or from a master.
Now of course, DTS and DD both use lossy algorithms for sound encoding and then it can be hairy as DD is more effiecent at the encoding then DTS is so it is hard to match bitrate for bitrate with DD/DTS. So it begs to question, what standard is more noticeable in bitrate reduction? Most will tell you DTS as more is lost at lower bitrates. But DTS tends to compensate this as on average a DTS track is 4-6dbs louder then DD at the same volume level.
I would have to bet in normal conditions, that 95% of people would not hear the differnce in the two audio rates (given a good source, not law and order) on TNT-HD or other HD stations. And I still find pretty much every one of my DVD's to be of better sound quality then anything TNT-HD has shown.
I do agree that if the space is there, they might as well use the higher audio, but I the lower bitrate in audio is much much less noticeable then the lower bitrates in video.
Of course we could really thow a wrench in and demand that HDTV have DTS as the standard audio format.
Here is a good page on some DD vs DTS stuff for those interested. It also touches on bitrates a bit.
http://www.audioholics.com/techtips/specsformats/dolbydigitaldts.php