For clarity's sake, existing film stock for the past forever still contains more image "data" than HD or even the new 4K process. This 48FPS does not contain more "resolution" than a 24FPS presentation does, just twice as many frames per second.
I don't think anyone said that. The 4K process is what adds the higher resolution. 48FPS helps to elimate motion blur.
But film stock is far more tempermental to work with. And it's also more expensive to buy and process. It also doesn't hold up well in the post-production process. Then there's exhibition. A film print quickly degrades, and after perhaps half a dozen showings it will show significant degradation. All of these reasons are why the industry has been moving away from 35mm film stock.
There is definitely the likelihood that movie-goers who have been watching films as far back as the 1980's are going to find the 48 FPS / 4K presentation TOO VIVID for their tastes. But this seems to be a harbinger of things to come, and we're probably going to see more movies shot this way.