CMV: Racially progressive futuristic shows celebrate segregation / racism implicitly

It is common for progressive shows about the future such as star trek to seek to show a diverse cast. However, the only way to keep such a diverse set of humans around hundreds or thousands of years from now would be to prevent them from having interracial relationships.

The real future of a diverse society is a racially homogeneous society where everyone sort of looks the same as everyone else. This homogeneous appearance has occurred in every human region on the planet from the native americans, nordic people, chinese, etc...

Segregation is the origin of racial diversity and integration is the end of racial diversity.

I know it isn't there intention to imply star trek lore has blocked black people and white people from being in relationships to preserve racial diversity, but any critical analysis would end up at that conclusion. Either that or the blood lines of the characters on the show are themselves a long line of racists who have avoided interracial relationships for hundreds of years.