^
I've attempted to anticipate and predict potential North American dates with very little success. They're VERY selective.
To add, they've been quoted that they don't really wanna do extensive touring anymore. "Been there, done that" kinda thing. They were on Zane Lowe's show back in May when Cali gigs were happening. Zane was poking fun at their US tour, and their reply was pretty coy. It mostly feels like it rests on what Tom wants to do, where Ed maybe just along for the ride at this point. Tom is a family man, so being away from home is taxing for any extended period.
Cost is another factor. The show is a lot more expensive then it was before. I imagine is a bit tough in negotiations with venues/festivals especially outside of Europe. Let's face it, The Chemical Brothers don't exactly bring the $$$ like a young, up-in-coming, artist.
Ultimately, I think they just prefer to play Europe and any new opportunities/markets that weren't available before during their peak through the late 90's.
I do wish they would be a little more blunt with their fans about their willingness/plight to play North America. There's a lot of scattered fans over here that are hoping for a future date, when you could just encourage them that you're strictly focused on costal dates (LA/NY).