The gap would already be dramatically reduced to within inches rather than metres. In effect it would be gone, although it would very literally be so if culture and conditions were rectified in a way that hasn't yet been tried in the United States over the past "150 years" (as if anything substantive was done in this time whatsoever). Of course, you can always disagree and argue from the basis of genetic determinism, but we all know the evidence for that is inconclusive and your "thinking" that it isn't won't make it anymore real.
Oh, and just to make clarion your intellectual dishonesty, what does all of this have to do with Founder immigration? Nothing. What is it really about? Probably racism.
I suspect women aren't attracted to computer science careers as often as men because they generally like more artistic and creative ventures. In other words, most women prefer careers and interests that allow them to be hand-on empathetic with the objects and people around them. In general, computer science is hardly portrayed as such a career. It may involve aspects of these things, but women generally aren't aware of it. The role models they see are all in the same sort of areas, and the majority of their female peers are all into the same sort of things.
It creates something of an echo chamber that simply multiplies a compounding effect with dominant culture that discourages women from even entering a computer lab filled with sweaty nerds, much less think about joining them.
You make a bunch of generalizations here without supporting evidence, especially with regards to the Black-White gap. Differences exist in and between (recognized) ethnic groups and are enforced by strict social phenomena (slavery for dark skins; liberty for lights). If we eliminated the entire historically privileged white middle and upper class from America, this would render the remainder of the population with much of the same social problems that plague the Black and Hispanic communities today. In this case, after a few generations the "gap" would very likely be as good as gone.
However, what this, and your comments in particular, have to do with immigration as it relates to Founders is beyond me. Your post basically just degenerates into one of those racialist garbage tediums (see paraphrase:"we've tried to fix blacks for 150 years"; slavery was abolished in 1865; segregation in the 60s; one can't right wrongs by not actually doing anything about them) that litter much of the white supremacist blogosphere nowadays. Hispanics, I might understand some frustration to do specifically with immigration, but what the state of Black America has to do with regards to Founder immigration I cannot discern.
Your tangent on how Blacks and Hispanics, two disadvantaged but otherwise tasteful groups, are figuratively destroying America is an example of practiced misdirection.Neither of these two groups objectively stand in the way of adjusting immigrations practices to allow more Founders.Hence your entire rant exposes itself as racist fear mongering drivel written by a someone with very little to say on the germane issue at hand.
Andrew Sullivan on The Atlantic has articles linking to cases of looting, fraud, child molestation and hoarding.
The Japanese government itself just isn't very forthright with regards to collecting and releasing information about victims and events.