Do you work in the emergency services? If you don't, it's probably highly unlikely you will ever need to deal with something so urgent that you have to rush out of the cinema.
I don't know, maybe it's because I went the first 20 years of my life without having a phone at all, but it really doesn't seem like much of a sacrifice to me to turn my phone off when going to the cinema. I'm in my 30s now and so far I haven't missed any emergencies, nor have I ever witnessed anyone rush out of the cinema to deal with an emergency. It might be worth considering how important responding to something so promptly really is. Most of the time, it probably isn't, you've just been conditioned to think it is.