Lol yeah for real. I live in Japan, and when I visit off the beaten road places, it's pretty common to find old people whose dialects even my native Japanese wife can't understand. And in China, you can take a 1 hour train ride and end up in a place where the local dialect is mutually unintelligible from where you came from - just the Chinese government forced everyone to standardize on Mandarin. Both of these places are known for being dramatically less diverse than the English world, and yet here we are.