Honestly, I don't think so. The collectibles market is hot and folks that were kids in the 1970s are now finding themselves with nostalgia, disposable income, and lots more time to search the internet. Pare that with the stimulus, in some cases, and you have a phenomena that rekindles the 90s publishers rush to tap a new market that ultimately fizzled. Here, we are talking about a somewhat limited supply, yet plentiful keys are going for ridiculous prices due to movie hype.
In conclusion, the movies contribute, but is one of many factors.