OK, this is going to be somewhat controversial...
WCMO - the rise of energy drinks.
Easily in any 7-Eleven or petrol station, at least one whole fridge is just energy drinks.
When I was in Japan recently, same thing. Every drinks vending machine had at least 40% of the machine offering energy drinks. Coffee, tea and especially any other soft drink / juice lines have ceded it to energy drinks. (Yes, I'm well aware that this is a commercial decision - you stock mostly what sells)
Yes, I'm well aware of the "original" keep-me-awakes, coffee and original Coca Cola, and their proliferation (coffee more than anything these days), but oh my word the amount of energy drinks is absolutely insane. Thank goodness they aren't offering these in airline lounges.