Here's the local supermarket in a little town, way off the beaten path. And there, right next to the cash register, are Lindt chocolate bars–from Switzerland.
Here's the local radio station, thousands of miles from the epicenters of music culture. And the next song–it's the one that kids in every country in the world are watching right now on YouTube.
Monoculture doesn't always mean the status quo. They sell more salsa than ketchup now. It doesn't mean only the established brands win–you can find Kind bars and Teslas in more and more places.
What monoculture does mean is that the churn isn't local as much as it's national and worldwide now. It means the stakes are far higher, because the step from niche win to worldwide win is smaller than it's ever been before.
Your blog, your line of clothes, your song, your cause–there's more competition than ever before (by a lot) because you compete with the world now. And there's more upside, too.