We as a species are very emotionally driven and slow trends and statistics just aren't as compelling as a big event. I don't know how bad the environment will have to get for that to happen though.
Otherwise, the people creating the most carbon emissions will just view this as an inconvenience and crank their AC higher. The numbers involved in the reporting (2C, 3C etc) just sound small and insignificant when in reality of course that's just an average.