I believe that the 33rd Glock mags are more practical than long guns for urban or suburban residents. Simply put, most of us are more likely to pack spare 33/31/27/22 round mags than we are to have rifles with us. Despite how fun it is to talk about our "go to" systems, fighting our way to long guns, etc... the reality is that we'll use what we have. Unless we see a long term interruption of emergency services, concealable handguns will continue to be the most practical defensive firearms for use outside of the home, and extended mags will be the most practical package for delivering firepower.
Currently Own: Beretta PX4 9mm, Glock 23 (Gen 4), Glock 19 (Gen 4) x2