A couple of random notes about the special and comments made here:
First, perhaps I misheard the documentary, but I believe they said that the Bob Goen version was cancelled by CBS in September, 1991. It is true that Wheel was cancelled then, but by then it had made it back to NBC; it switched back to its original network back in January, 1991.
Also, there was some discussion here about whether or not Chuck could do the job today. Who knows for sure, but a related anecdote: One day at Greed, during a commercial break, Chuck was talking about his time on Wheel (I don't remember if the discussion was related to the couple of times on the show when his Wheel hosting became the subject of discussion), and all of a sudden he broke into his old routine: "$500 is the top value on the wheel; watch out for that black space, Bankrupt, because if you hit it, you lose all your cash, but not your prizes, because once you buy a prize, it's yours to keep." Didn't miss a beat. He followed that up by remarking, "I don't remember any of that Scrabble %$#@!"