Well
1 - how do you know, unless you know we're already in one?
2 - I didn't say that, I simply said IF we are actually getting dumber, it doesn't really matter. Dumbness here is only a mode* score, not an average. Collectively, the human race is getting smarter, more peaceful, more thoughtful, more educated, more rational and more advanced in every way.
That's the important thing here