I think it depends on what you count as black/brown.

If you believe in the "one drop rule" that one drop of black gene makes you black. Then I would agree with you.

But for most people. Most people are going to go by what they see with their own eyes.

A women like the Actress Rebecca Hall is 90% white and 10% black.

Most common people will see her as a white women. You wouldn't know she was part black unless she told you.

If racial identity is important to you.

Then you need to advocate for those mixed half white kids to marry white and have a kid with a white person.

This will create more of the Rebecca Hall types.

Which looks like this https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRkXqCc_O-ZqRSwzBmGBtomUaR2_ogQpbNjSDOYY4QcAi6e5Y6D

So it really depends. If you are wanting a pure euro person.

I personally think long term that is kind of unrealistic. As communication improves between people.

People are going to naturally expand their dating options.

Speaking of race mixing. Over here in Chicago.

I am not seeing more black guy/white girl couples. It's been about the same.

What I am seeing a lot more of. White Men/Black Women have EXPLODED over here in Chicago.