The best replacement for instant messaging is email.

The best alternatives to instant messaging are rated as following:
★★★★★  email
★★★★  text messaging
★★  chat
★★  texting
★  sms
  chat rooms
  e-mail
  web based chat
  online chat

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Google Trends

Scale is based on the average worldwide traffic of instant messaging in all years. Click on graph for more.
instant messaging
email
text messaging