Well, unfortunately WDIA has taken a massive hit with the advent of the PPMs; while people were reflexively writing WDIA in their diaries, the PPMs have shown that not that many folks were actually listening to it. This is probably the beginning of their downward slide, sadly.
I've noticed that, with the passings of Rufus and Jaye and the removal of Fred Moore, I don't even listen to All Blues Saturday any more.