It's an interesting but flawed essay. It's glaring flaw is the fact that the attitude she speaks of is found in younger voters BUT the vast majority of the electorate is still made up of old set in their ways fogeys.
How is that the article's 'glaring flaw' when that is the very point of the article? The part at the end that you made boldy-bold and stand-outty clearly states that the question of electing a black or woman president is becoming superficial specifically to young voters. It doesn't say that it's a trend across the board.
I guess I see it as a flaw because it paints a too hopeful note when Gen Y voters, although larger this time around, still aern't enough to make an overall difference IMO. It's a hopeful sign is all and if anything, it may sway some races ever so slightly, but it isn't some sweeping trendas you pointed out.