I suspect so, too. He probably knows he'll never top Casino Royale. I only saw him as a possibility because he doesn't seem to have done anything since (though I notice he's currently helming Mel Gibson's new film).I have the feeling that Campbell is permanently out of the frame for a future Bond film, unless EON throws absolute mountains of cash at him (and I imagine they don't feel that need, really).I guess we can probably rule out Campbell, too, as it looks like he's attached to Green Lantern, due out at the end of 2010. Unless Bond 23 hits screens at the end of 2011 and Campbell feels like leaping from one big budget film to another.
Is Stephen Frears still a possibility? His schedule seems to be clear. Frears was attached to direct the Jinx spin-off film all those moons ago.