This article is not some intellectual thinkpiece that only the literati can comprehend. Trends change, humor evolves. If "shoop da whoop", rage comics, leetspeak, and motivational posters aren't funny anymore, it's not because people "got stupid".
I assure you, the reason McSweeney's is no longer funny is not because the humor is too smart. "peer review deez nutz" does not require reading above the sixth grade level.