Whatever they fail to possess in reality, they will make up for in myth and deception. And I didn't mean to imply they'll use White as a self-descriptor. They'll just degrade us to below their level.
We will one day need a definition, both scientific and practical, if we are to have a race-based state. It could be (partly) based on having no more than a certain genetic distance from some reference genome, or it could be based on documented European ancestry. Whatever the definition, it will not be "perfect," since race is an evolving, moving target. I think it should include almost everyone who defines himself as consciously and loyally White, and exclude anyone who does or likely will identify with some other ancestral strain.
Mentality is a factor when deciding who we want in our nation, and who we don't. (What Yockey called spiritual race is related to this.) Let's do a thought experiment. Imagine four people, all of whom pass our genetic test for Whiteness. Visually, all of them could pass as natives of any European capital. Person one is from Lugano and knows his ancestry back 200 years or more and it's all European, and he's proud of it. Person two is from Oklahoma, but despite the fact that his Amerindian ancestry is very small and might even be mythical, he deeply identifies with the "Indian shaman who loved a tribal princess" story that's been passed down in his family, and he wears Amerindian accessories and has Amerindian decor in his home. Person three is from Mexico City, but he and his family are fiercely proud of their White European ancestry and intend to always preserve it. Person four is also from Mexico City, knows he is entirely White, but nevertheless identifies deeply with being "Latino" and considers mixed-race Latinos as "his people" and sees non-Latino Whites as distinctly foreign.
The Jews, and Christianity, have severely damaged our racial mentality, and their open borders policies are destroying us physically and genetically.