The heat never stopped people before. Before we sold our DVC, we made several trips a year, starting back in 2000. Parks were always crowded in July and August, but we went anyhow, heat and all, because that is what was convenient for the rest of the family traveling along. There were days in the high 90s with a few days around 100 and 101.... and still crowded. People just took their fans, dranks lots of water, took a lot of breaks and went in stores more than usual. The biggest difference was fewer babies in strollers between the hours of 1 PM and about 7 PM.