Yeah that'd definitely be comparable to Oldman's casting. But Oldman's face is slightly less frightening than Willem Dafoe's.
I'm hoping that Gordon has a role in BvS. Alfred is almost guaranteed to be in it, but I'm not so sure Gordon will be.
Anyways, I need Cranston in the DCU one way or another, be it Luthor or Gordon, I don't care. It'd be a shame not to get him in a DC movie when he's already expressed interest.
I could see Cranston, Viggo Mortensen, Jeff Daniels, Kiefer Sutherland, John Cusack, Willem Dafoe, Jeff Bridges, Steve Buscemi, Mel Gibson working in the role
And Bullock better be in the next Batch of Batman movies.