Cultural dominance ruining diversity?

I don't think it's just cultural dominance, it's more like the wealthy will always have a way with they do can do and control. Corporate giants may go out of their way to force rivals out of the competition to maintain monopoly. Even though there are several laws to protect such practice to protect the well balance of consumers and firms. But back to your point, I will agree to your topic statement, but it is not necessarily a bad thing. Imagine diversity all over the place, with no common way of communication and appreciation of other cultures. It'll just bring segregation and you'll have a lot more conflicts. Maintaining a balance in between is ideal, but of course, that's up for subjectivity. I wouldn't say it's ruining; discouraging practice of diversity is a better term since people still have the right to withhold their own lifestyle and culture.