It's just Bubble Tea repackaged.
Bubble Tea used to be quite crazy 10 years ago.
And then it fizzled out. 
I thnk there's a possiblity of being a fad, now that you
mention, teens stuff always die out fast. If I'm a bussinessman,
and only teens buying my stuff I will only plan my business for a
year or two and will exit from this thing when the fad dies.