* network communication to support pervasive augmented reality
* various new forms of symbolic communication supporting collaborative cognition (eg argument mapping in a way that allows a community to have a debate without any individual participant understanding all the details of either side; eg systems for an online community to speak in real-time through a human representative via voting on what the rep is to say)
* various new forms of technology-enabled language (eg going to a party and seeing a person talking and as they talk, around them appears various projected icons offering nuance, more information, or structured conversational protocol information regulating eg turn-taking; eg a form of language in which neither human understands all of the words they use, but in which both are using a computer assistant in the manner of computer-assisted chess)
* lowtech versions of advanced communications protocols, practiced by survivalists in case of an apocalypse and/or by people who want privacy from online surveillance (not that this would help unless there is no IRL surveillance in the vicinity), eg human-mediated blockchains, eg sneakernet message routing (eg Pynchon's Crying of Lot 39's Trystero), eg encryption by hand. And then variants of these which can interoperable with the electronic/high-tech versions.
* communication mediated by networks of AIs that dynamically modify/invent new communications protocols
Doubtful that all of those will be feasible/useful but probably some of them will be. I imagine that most of these will be difficult to use, at least at first.
* technology-mediated telepathy
* darknets
* internet-of-things
* space internet
* network communication to support pervasive augmented reality
* various new forms of symbolic communication supporting collaborative cognition (eg argument mapping in a way that allows a community to have a debate without any individual participant understanding all the details of either side; eg systems for an online community to speak in real-time through a human representative via voting on what the rep is to say)
* various new forms of technology-enabled language (eg going to a party and seeing a person talking and as they talk, around them appears various projected icons offering nuance, more information, or structured conversational protocol information regulating eg turn-taking; eg a form of language in which neither human understands all of the words they use, but in which both are using a computer assistant in the manner of computer-assisted chess)
* lowtech versions of advanced communications protocols, practiced by survivalists in case of an apocalypse and/or by people who want privacy from online surveillance (not that this would help unless there is no IRL surveillance in the vicinity), eg human-mediated blockchains, eg sneakernet message routing (eg Pynchon's Crying of Lot 39's Trystero), eg encryption by hand. And then variants of these which can interoperable with the electronic/high-tech versions.
* communication mediated by networks of AIs that dynamically modify/invent new communications protocols
Doubtful that all of those will be feasible/useful but probably some of them will be. I imagine that most of these will be difficult to use, at least at first.