I dunno about where you are, but Bubble Tea became a Big Deal here (Winnipeg) 2 years ago and most of the Chinese/Viet restaurants offer it here - and it is a big part of their business (HUGE part of some) I've managed to sample most of the most-highly recommended places. Probably the most interesting factoid is that hardly any 2 people have the same favorite flavor. My daughter had like at least one a week the first year, partly because one of the best places was just around the corner from her school. Anyway, it has died down some, but definitely not a flash-in-the-pan thing.