I certainly don't know why Scott Lobdell is off "Red Hood," and it certainly is most likely that he just wanted to manage his workload after picking up Superman.
But one thing that has been touched on in this thread is absolutely true: If you move enough product in this line of work to the degree where you're "needed," at some point, you get to do whatever the fuck you want. Some guys turn it into their dream assignments, some guys turn it into creator-owned kingdoms, some guys turn it into power at a publisher.
But it's absolutely been that way ever since I was a kid, even moreso when Image was formed. So, yeah. There's no doubt in my mind that Scott Snyder is calling some shit over at DC. There's absolutely no doubt in my mind about that. He moves too much product for them for it to be otherwise -- keep in mind the last guy who moved as much product as Snyder is now DC's Chief Creative Officer, seewhatI'msaying?
*Sniff, sniff* "Damn it, Diana...If I'd known they would trade us in for a JT Krul-written Captain Atom and "The Savage Hawkman," I'd have let Superboy-Prime destroy all reality.""Superman flies and is really strong...what the fuck else do you need to know?!"
-- Hitler, expressing his displeasure about DC rebooting and complaints about continuity