The fact that DTV is going to end SD transmissions is NOT unsubstantiated. It is only unknown when and what (if anything) will be broadcast from the 101 satellite when they do. Those of us using a Winegard Trav'ler could care less (but I will miss being able to switch to SD in a really bad rain storm!) but dome users are likely in for a very big surprise when it happens.
You likely don't remember 2000 (or 01) when DirecTV initiated their spot-beam broadcasts of local Networks. I DO! One day we were watching NBC from FL while in WY and the next day ALL Network programming was gone. No warning, no previous information. They were just gone. It took some time for us to find out what happened. I believe it's about to happen again but this time we will have had some warning mixed in with a lot of bad information about the drop dead date.