The hype cycle
Not drinking while you're out is quickly becoming the 'in-thing' to do.
Of course, just yesterday that wasn't the case.
But back during prohibition is was.
And before that? (You get the idea.)
Point is, trends come and go.
You can't predict the rise (or decline) of a trend any more than you can predict the future (none of us can). But paying attention to the times can at least help you notice what's next.
... Related: This is a fantastic campaign to support!