Your whole argument could be applied to biology too. If someone proved the theory of evolution false, millions of geneticists would be out of a job therefore we should suspect the theory of evolution to be false.
That's a great point -- and maybe explains why the theory of evolution had so much push back for so long? Maybe there's a link to skepticism and these kinds of financial or credibility links? Is it subconscious even? Could be useful in anticipating which theories would face more pushback?
No, the theory of evolution didn't have so much push back for so long because people thought "scientists are making this up just to get more grant money". It was because it went against mainstream religious belief of the time.
He's positing, not decrying that evolution vs. creationism wasn't because it went against the mainstream religious belief (which is still iffy without proper research).