You know... initially I thought this was yet another example of Moore exercising his Grumpiest Man in The Universe title... but if DC wanted him to agree to prequels and sequels, which Moore has made clear he wants nothing to do with, then I say good for him.
He's right not to trust DiDio. He's possibly the worst thing to happen to DC in a long time.
I really, really don't like what he's allowed Grant "All I do is Meta-fiction" Morrison to do to Batman, and I can only weep at Jim Lee's continued (in my view misguided) involvement with the other two.
Jim Lee's art makes me want to weep because of the clarity and style, and while I realise it's reliant on an inker and colourist, it's Jim's vision.
I digress...
I think Moore is right to stick to his guns, but at the same time, he's a temperamental artist who I think was wounded by how he was treated by the Business side of things all those years ago.
Shame, really. I'm sure he feels very strongly about it.
Moore isn't your typical writer- he's also got a highly developed sense of integrity and about his work.
I'd rant further on DiDio, but it's late
In fairness to Moore- he hates soulless, unbridled capitalism and encroaching government influence (of any government) but it seem to me that he was a naive, wide eyed young writer who saw something he loved, thoughtful story telling, and saw it devoured by corruption.