It's too challenging and bleak. Beneath the light tone, it mercilessly drives home the truth that all of modern society exists in a temporary historical juncture that is not stable over a timespan of mere centuries. Instead of the smoothly increasing "better everything" over time that was practically a secular religion in the latter half of the 20th, we're told that things will change drastically in the not that distant future, and not in the manner we've believed.