In the sense that it's not used as widely, except in certain circumstances? No way! Email is here to stay for a long, long time (maybe even beyond the lifespan of anyone reading this in 2018). Even if person-to-person communication has shifted to different apps and platforms (like Facebook or Telegram or WhatsApp or Snapchat or Instagram or Google+ or what have you), communications within companies and communications from companies to customers, potential customers, suppliers and others, are cases of large scale regular use of email — as a communication platform and an archival platform.