I see UHF/Trivia links here, to say that the film fared poorly in theatres only to become a Cult Classic on prerecorded home video.
VHS isn't cable. VHS isn't linear television (but be kind, please rewind).
Better on DVD isn't the same trope, as that involves box sets of entire series in binge-watching compatible formats. A feature film (at least if it was a flop at the box office) isn't a series.
Is there a trope for Vindicated by Video? Alternately, should this trope be broadened to include the small screen in all formats?