For the first time since SMS was created in 1992, the volume of text messages has declined. According to research from Deloitte, texts from cell-phone users in the U.K. fell by 7 billion last year, to 145 billion, while IMs through various apps rose to 160 billion.
SMS is basically the new fax machine, and soon, everyone you work with will request that you only communicate via Snapchat during business hours. It doesn't make any sense, but that's just the natural, inevitable course of this flowing tide. It's best not to fight it, but to paddle along, perfecting your duck face.