Would any joke be funny it it missed the punchline?
Why present hypothetical situations when those situations aren't what actually happened? You could do that with anything - 'would this have been funny if the guy didn't fall over and landed his skateboard fine?' The fact is, he waited in line a long time, which is proven by the fact he got his phone first. And...he dropped it. It's kind of funny because he has obviously queued a long time to get it, only to drop it. His reaction is largely irrelevant...all you can do in that situation to save face while on camera is to act like it's fine, so you don't look so silly having dropped it.