I polluted Rob S' thread on what AR to recommend to post Orlando panic buyers, and decided I should just start a new one.
I love long guns. In Alaska, I walk around with a long gun in my hands almost daily. Nobody thinks twice about someone walking around with a long gun around here.
However, in urban areas, for non LE I see the role of a long gun almost exclusively for home defense, and in a very limited number of situations outside your home. For a non LE person, I just don't see carrying a long gun around in the vehicle as very useful. You have to protect it from being stolen. It is added weight to carry in and out of the hotel room. It may not sit well with LE if you get pulled over. And, in an Orlando type situation, you will almost certainly be fighting with the gear that is on your body.
Not sure about you, but I don't want to be the dark haired male, not in uniform, grabbing my long gun and heading into a shooting situation, as it seems like a good way to identify yourself as a shoot target to an active shooter, law enforcement or a concerned citizen.