The boyz over on BJRI didn't like the idea of BJs buying out Granite City. Although, I still argue that GCFB and BJs would be a really good fit together- BJ's is sitting at 60+ restaurants and is trying to move east, and isn't in the same areas as GCFB yet. It'd be a good way for them to pick up a lot of stores and a new region relatively fast.
Similar restaurant decor`- stone, wood and leather, tvs... Custom microbrews. Fermentus Interuptus has to be very attractive to a larger chain microbrew chain too. BJ's would only have to build 2-3 more worthouses and they'd cut their brewing costs significantly while maintaining quality control.
Of course, there is the matter of buying the patent too.