Great question. I think a corresponding question is, "How endemic to Western culture--whether pop or 'high'--are the Marseilles trumps?"
The answer to both questions is, very much so. In the case of the Weiner Brothers Productions card, I would tend to agree with your assessment that this man must know at least a little about tarot and have at least a passing fascination with it; the choice of one's production company's logo is not a light one, I imagine.
But there are many other examples of cases where it's clear that there is little knowledge of tarot and that cards have been chosen for their imagery or archetype; this is evidence for the cards--specifically RWS and Marseilles--having entered the visual pop culture "language" or lexicon. See, for example, the Dolce and Gabbana perfume range that came out a few years ago, based on the trumps. Although they used Deviant Moon images in the magazine adverts, I believe the Marseilles trumps were the underlying starting point.