I think of communications in a three dimensional matrix:
- Along one axis is the type of message (text, voice or video).
- Along the other is the level of immediacy, ranging from immediate via somewhat delayed to almost time-insensitive.
- A third axis could have the type of device by screen size: inch (mobile device), foot (computer) or yard (TV).
- The immediate form is chat (inch or foot).
- SMS (inch) is somewhat delayed.
- Email (foot or inch) is even more time-insensitive.
- Traditional voice calls (inch, foot) are immediate.
- Voice-to-SMS conversion (inch) is the delayed version.
- Voicemail (inch) is the least time-sensitive.
- Videocalls (inch, foot or yard) will be immediate.
- Recorded videocalls could be alerted for via SMS for a somewhat delayed experience.
- Recorded videocalls could also be vodcasts or YouTube clips (least time-sensitive).
Finally, what is missing in the matrix is mainly yard-versions, such as reading email on TV, but obviously that may not develop into the mainstream. SMS delivered to the foot-screen (computer) is probably a good idea (examples, anybody?). Voicemail to the inch-screen could be done by podcasting.