I see what you're saying. I do feel interracial couples don't get enough promotion seeing as how they're increasing in the real worls, but neither do single race PoC couples. And you're right, there needs to be interracial couples not involving white people (although wasn't Storm part of one?).
It would help if teams had many black characters of both sexes, as well as giving PoC love interests to white heroes. The default romance for white heroes shouldn't just be monoracial