The way that some are completely unwilling to consider any possible cause for concern of any kind, it seems kind of weird. Like maybe Disney has people on here trying to sway opinion.
Reading thru these threads about the gondolas and heat, it is fairly amazing how many people lack understanding of the difficulties that some face related to heat.
5-15 minutes in the heat could be no big deal, but consider that the gondolas will be under the hot sun for hours. They may have reflective coating, but they are still metal, and over the course of hours, metal absorbs heat. Most young people can deal with a little heat without much consequence...