Was the "cyberspace" trademark overturned because of Gibson's protest? In my opinion he'd have a strong case in court against Adobe.
The legal side of Gibson's protest certainly did not go beyond sending a cease and desist letter. People tend to overestimate how much money even successful science fiction authors make (unless one of their works hits big in Hollywood).
The OP's actions and remorselessly douchey recounting of them ought to be read in that light: Autodesk cost Gibson time and money and then the OP wrote a letter to taunt him about it. All credit to William Gibson for his amused tolerance of the situation, assuming that part of the story is accurate.
The OP was kind enough to share this story and give us a glimpse into the project and window of time and I think we should be supportive of that.
In regards to Autodesk - I'm not sure a corporation would even send a letter these days, let alone one written in the positive spirit this one is.
Finally, the OP and Gibson met and buried the hatchet so to speak.