Three more words in response to those two: first responder "concerns"
What theater owner is going to want to invest in retrofitting their structures in a way that WILL generate negative attention from the fire inspector? ("So, you're telling me that you want to upgrade your building in a way that makes our radios not work inside?") Sure, repeater systems would allow firefighters/police/EMS radios to work inside such structures, but that's something that would need to be included in the initial installation, and don't think anyone but the theater owner is going to wind up footing the bill for that. (OK, customers eventually, but that's cold comfort when you're writing the check. Cash flow, you know?)
We should all remember that a Faraday cage will restrict/eliminate wireless connections, but won't do anything to the local resources of the device. Texting, email and calling? No, won't work. Angry Birds and video camera? Yes, work just fine. Oh, and guess which one of the examples I gave is the one that the MPAA/Hollywood want to block? No theater owner is going to be able to get financial help from those entities for installing a system that can't shut down cellphone cameras.