Making endeavors like this scale is an interesting problem. On the surface, this is inherently unscalable, but it does prove that a novel idea can spark latent compassion to create something truly awesome. The obvious thought is applying something like Batkid to third world cases, but it would end up helping out a few cases in the millions that exist. A cynical view is to look at this as an example of first world individualism triumphing over the greater need of larger populations, but I think it's worth thinking about it the other way round - how might it be possible to use compelling stories like this to solve a larger population of problems.