I find it strange that the author gets so much flack, HERE of all places! It's clearly just a fantasy, and she made that clear at the outset. We all know that this kind of crap is just nonsense, but it's fun to imagine. Like science fiction, action films, etc.
As for my reaction-- I don't like too strong attempts to make these stories plausible- they only backfire and make the readers realise it's a story-- i.e. historical comparisons, while perhaps appropriate, only make us think logically, which quickly defeats the whole idea.
However-- I do LOVE the idea that white men are more and more denied sex as more and more white women realise that Black Men really ARE superior, and as the trend continues, first seen at high schools, etc, then moves into the mainstream, then finally to all areas of society, white-white couples just get rarer and rarer. White boys see Black Men and white women together and think of it as the norm. They stop trying to date white women altogether, and give up. White boys don't ask white girls to dance, they don't ask them to the prom, etc, they stop askign them of dates, and sooner or later, almost al couples are interracial. Only older couples are like to be white-white, while nearly all younger couples are black male-white female. White boys learn at an early age the they have been well and truly defeated, and consign themselves to masturbation, watching interracial couples, sitting at dances and watching mixed couples dance, going to bars and watching mixed couples. They get their thrills vicariously.
This becomes so usual that when Black Men see white men in the public toilets, for example, they may casually ask them if they were walking, and what to. The white boys say which couple they found sexy and had to go and jack off to. The Black Men laugh or are complimented when it is them. Racial tensions are actually much lower, because white boys no longer try to compete. They know they have lost and accept it. They have surrendered to the superior Black Man. White women, of course, have never been happier. They look back at the days of non-interracial sex as a time of hardship and sorrow.
Of course, at some point it is clear that white women will also die out, as all babies will be mixed. This is the rub. Either this is accepted and later it will be seen as a golden age for white men to be cuckolded (from their perspective) or a golden age for them to be eradicated (from everyone else's perspective), or, for some diehard fans of snow bunnies, white male may have their semen taken (collecting it from boys who are accustomed to masturbating over interracial couples will not be difficult!) and white women artificially inseminated. But this is perhaps the ethical question of the day for this wonderful society to ponder, as happy white women have amazing, fulfilling sex exclusively with Black Men, and wimpy white boys are sidelined and happily accept their defeat by jacking off. Ah...paradise....