It's a creeping narcissism that leads people to be increasingly unaware that there are other people around them.
Strangers don't owe you their attention. Any more than guys are entitled to sex because they think you're "Hot." Not paying attention to everyone around you while you go on with your life isn't creeping narcissism, it's finite attention span/awareness. I seriously doubt that anyone is completely unaware that there are people around them out in public, unless they're walking with their eyes locked onto a cell phone.
If so, so what? That's narcissism? It's at best a minor annoyance if they bump into you, instead of a light pole, or step off the curb, and twist their ankle. I won't call it narcissism, but the idea that people owe you their attention is at least Entitlement. Why should they care about you, a stranger on a street, more than they care about their own safety?
It's just possible that cell-phone dude is going to help his friend, and keeping her on the line to reassure her by Text. She might be suicidal, or just lonely, it doesn't matter. You don't know, you just quietly, or loudly resent them for having something more important, or interesting to care about than you?
Oh, and one other thing. Just assuming you didn't have your eyes locked on a phone, and you ran into them. What's your excuse, you didn't see them coming? Oh, right, they ran into you, because "Creeping Narcissism," and being completely unaware that there are people around them. Since you're so aware, maybe you should try getting out of their way.