Motion blur is no longer a problem for high-end video game production. What high frame rates do for a game is enable it to portray moderately fast motion and three-axis panning without stuttering effects. These are exactly the types of shots that 24p filmmakers have learned to avoid. The classic "dreamy" look of cinema is both an aesthetic choice and a technical necessity. Video games tend to emphasize action and adrenaline. I can easily see sci-fi, action/adventure, and horror filmmakers migrating to higher frame rates to increase the visceral impact of their movies.As for video games you must have high frame rates because they are void of any type of motion blur. Video and film do not suffer from this so we cannot say film and video should be 60p because people are used to videogames at 60p. That is an apple and orange comparison.
Finally how exactly does Cameron plan on delivering these movies to the masses? Apple devices support 30p tops. Blu-ray only supports 60p in 720p mode. Personally I have no problem with a 720p Blu-ray but I think that would be a hard sell to the masses that have been brain washed about how much better 1080p is then 720p. Would a DVD release be 60i?
James Cameron is no doubt targeting his future productions to digital cinema projectors that are built to handle high frame rates. He may well have set his sights beyond Blu-ray and consumer distribution via physical media. The future is broadband media streamed directly to networked HDTV capable of 120-240hz frame rates. Shiny discs are cumbersome, inadequate, and obsolete.
To my eyes, frame rates from 24-30p do have a special appeal that higher frame rates lack. What I think is misleading is the so-called "180-degree rule", mythologized from the semi-circular shutters of vintage 24p film cameras. This rule dictates that shutter speed should be set as close to half the frame rate as possible, which is 1/48 second for 24p. While I too like the look of motion blur from around 1/40-1/60 second, the 180-degree rule would imply a 60p shutter speed of 1/120 second, which is too crisp for my taste. Particularly in dealing with 60hz lighting, I've found 1/60 second shutter to produce consistent motion blur with 24p, 30p, and 60p frame rates.