Tron's a great movie anyway (I have watched it a few times recently). I know some hackers these days who tell me that the first time they heard the word "hacking" used this way was Tron in the early 1980's. Of course, I was too young for that.
I think it's rather silly to say that the movie was prophetic, to be honest. I mean, monopolistic companies have existed for quite a long time (think oil, steel, and railroads in the late 1800's and early 1900's).