No, no they couldnt do that. Not if they wanted to do well like they always do. At this point...from a marketing standpoint....and from a box office stand point...
Justice League for May 15th, 2009.
More than likely would be the movie event of May, and probably the summer. MOS would have to go July, not May. JL is just a far bigger risk...**** it up and you dont just lose superman franchises...you potentially lose all the characters involved, thats why Batman needs to get the hell outta there. That said...they still have Batmanin the script...Nolan and Bale made it pretty clear they wont be involved yesterday....and if they try and recast Batman the uproar from the internet would be among the biggest ever...while MOS is already cast, crewed, ect.