Is anybody else struck by the irony of debating the effect fan petitions have on the outcome of a franchise on a STAR TREK board?
No, because it's a myth that the "Save
Star Trek" campaign actually saved the show. According to documents presented in Solow & Justman's
Inside Star Trek, the campaign was much smaller than Roddenberry later claimed, it was largely organized by Roddenberry through Bjo Trimble rather than being the grass-roots movement he spun it as, and there's no compelling evidence that NBC was actually
going to cancel the show at all. It was just "on the bubble," its fate not yet decided -- and while having a passionate fanbase didn't hurt, it earned its renewal the same way that countless other bubble shows have earned theirs, through the producers striking a deal to reduce the budget of the following season by having fewer episodes, fewer guest stars, more bottle episodes, less location work, fewer original episode scores, etc. The famous onscreen announcement that tends to get interpreted as "All right, fandom, we surrender and will uncancel the show as you demanded" was more just "Listen, fandom, we're not actually cancelling the show so please stop flooding our mailrooms."
And even if the letter campaign had saved the show, it would've been the exception, not the rule. The belief that it had worked prompted countless other attempts at fan letter-writing campaigns over the decades (once in high school, a classmate tried to get me to sign a petition to save
Mr. Smith, a mediocre sitcom about a superintelligent orangutan who went into politics), but only a vanishingly few shows have ever gotten their fates reversed by fan campaigns or petitions alone. Like I've been saying, it's important to understand the difference between a lone exception and a general expectation. One success does not guarantee others.