The praise from the video game industry is expected and certainly familiar. It's the responses from the other side though - not to put too fine or too immature a point on it, "the losers" - that proves interesting.
Contrary to popular belief, theaters are not required by any statute to keep kids out of R-rated films. They do so under their own discretion, much like video game stores working in tandem with the ESRB rating system. Passing a law in similar terms for video games would mean they become the only regulated mainstream entertainment product.
Imagine, a crucial scene in Citizen Kane lost because we have no means of accessing the film canisters. Think of Action Comics #1 with the first appearance of Superman without the all-American hero, all because the business dictated only a certain consumer could access it.