[Note: This report was captured from a slideshow document, which can be downloaded here:
Project Horseshoe 2017 - Better Than Dialogue Trees.pptx]

Additional links you may find helpful:

More ideas for experimental dialogue systems:
https://www.gamasutra.com/blogs/BobbyLockhart/20171107/309121/
5_Radical_Ideas_for_Dialogue_Systems.php

Example of a player choosing the point of view of the story rather than modifying the story itself:
https://www.geekwire.com/2017/
interview-filmmaker-steven-soderbergh-bends-rules-tv-movies-mosaic-app-hbo/

Forum thread on making dialogue in games inherently fun:
https://www.gamedev.net/forums/topic/657677-ideas-to-make-dialogue-funengaging/

A concept for linking narrative and dialogue systems together:
https://www.gamasutra.com/blogs/RonNewcomb/20110719/89854/
Reusing_Planning_Trees_for_Interactive_Dialogue.php

A psychological theory about how people interact in social situations, in ways that could form the basis for a conversation system:
https://en.wikipedia.org/wiki/Politeness_theory