It's a bad strategy to have. I've been there. Feeling good after Bush's win, which was really a 49+1 type of strategy that has a short shelf-life.
You can't plan on always winning elections by getting a tiny bit of white Americans, a few college girls, and then minorities every single time.
40% is not a tiny bit.
Not that I disagree with the fundamental point--you simply can't extrapolate into the future and say this means Democrat dominance. For the same reason "Bush won 97 of the 100 fastest growing counties" in 2004 didn't mean that all future population growth would favor Republicans. New candidates will remix the math and the issues at play. Republicans will have to lose the gratuitous and nasty racism of some of their spokesmen and learn to be more sensitive, and not just because it's "politically correct,” but some approximation of the Republican platform with a ticket led by an old white guy will win the presidency in the future.
