Although ratings for the movie were high, with Nielsen Ratings reporting 10.0 million viewers watching NBC with 4.0/10 households tuning in.[8] Knight Rider was generally received poorly by media outlets. IGN gave the movie a rating of 5 out of 10 saying, "No one expects Knight Rider to be particularly thought-provoking or deep, but something a bit more enjoyable would certainly be appreciated next time."[9] Variety stated, "unfortunately, even at 200 miles an hour the times appear to have passed the concept by, and making “Knight Rider” road-worthy for further adventures will require more than just a tune-up."[10] The Los Angeles Times stated, "The two-hour (!) movie/pilot/extended Ford commercial crept by Sunday night like a glacier with turbo-revving sound effects. (No advance screeners were available, never a good sign.)"[11] Even with poor reviews, NBC captured first place within the 18-49 demographic. The movie averaged a viewership of 12.8 million viewers.[8]
It seems to me it did well in its demographic, but I would deem another episode unlikely - this was a backdoor pilot, and if the ratings don't add up, another shot will be unlikely. Nielsen deemed the ratings as poor, so I think it may be safe to bet that the backdoor pilot will not be extended on if this is anything to go by.
Plus it has had poor reviews, so NBC will probably drop it IMO.