It's not dubious, it's completely untrue.
Piller was in the normal process of renegotiating his contract, and he later said that he invested some of his thinking about that in Riker's behavior in this story. Early in the period when this was written it was possible that Stewart and/or Spinner might leave, and the storyline took that into account. But there was no "FU" or general rebellion there.
People seem unaware of the story vetting and script development process on shows like this. The image of a gaggle of staff writers shoving a script through the mail slot on a Friday and leaving production in the lurch while they hit Hamburger Hamlet for magaritas is ridiculous.