I think that the 'real reason' for Blackburn getting it is that he was rather unceremoniously dumped off Pick of the Pops for making some stupid comments. Now he's being rehabilitated, he's being given a show suited to his era (though I think he would prefer Johnnie Walker's 70s, from which he would extract Eagles etc and add disco). And it's at crack of dawn to show him who's boss still.
All entirely supposition, but I am really sad to have heard, so close together, MC Desmo and Brian Mathew do their final regular broadcast shows. I enjoyed Sounds of the Sixties. It was just right for that time of the morning - eclectic, interesting, sometimes appalling, but never offensive. And Brian's warm voice with the intelligent and slightly jokey chat was ideal. Waking up to Tony Blackburn's manic mid-atlanticisms is a nightmare.