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Taro always has good input, but there are at least two ways that things aren't meshing here.
First, Taro is insisting on K/AB, which is fine, but fangraphs is the only place that I've found it easy to find K%, and it reports K/PA.  So a lot of the data is confused.
Robinson is career 25.1% K/PA and 28.6% K/AB
Granderson  MLB career 21.8% K/PA and 24.7% K/AB
Granderson in minors career 18.8% K/PA and 21.8% K/AB
Cammy is MLB career 24.2% K/PA and 27.9% K/AB
Cammy in minors career 21.8% K/PA and 25.4% K/AB
When we are talking about thresholds, it's really important to compare apples to apples.  So there's a ton of confusion here.
So, yes, if you are looking at career minor league numbers per AB, as Taro has it, and using his criteria:
Granderson 21.8%, "within the threshold" but just barely
Cammy 25.4%, "not likely to succeed"
Trayvon 28.6%, "virtually no chance to succeed"
What G and others point out is that Cammy brought glove/speed/60+ walks/30+ doubles/20+ HR to the table.  Take any of those away and the K% might have done him in, sure.  But he did have all those things, and brought them to the table every year.  So I don't see how you rule out Trayvon, when he might bring all of those things, too.
Second, as Sandy already pointed out, Robinson switched in 2011 from speed game to power game -- either by design or accident or because he found the thinner air to his liking, whatever. 
For the three years prior, he was using his speed game.  For those years, his K/PA was 23.1% and his K/AB was 26.5%.  Still a hair higher than what Cammy did in the minors (21.8 and 25.4), but not massively so.  But, yes, definitely higher than what Granderson was doing in the minors.
In 2011, his Ks have spiked again, but as we've said, he's switched to the power game.
My comment yesterday was "I love his AA line," and it certainly seems that he has shown that he can dial back the Ks to at least a roughly Cammy level and if he can do that with 0.4 eye + glove + speed + doubles + decent HR, I don't see why he can't have a roughly Cammy career, which, of course, can be an all-star career in Safeco.
If he remains so enamored with the power game such that he can't get the Ks back down, then, yes, I think Taro is right that he'll struggle in the majors, and I give him credit for that.  If the big-HR game comes at the expense of a K rate that is way higher than Cammy's, then Trayvon needs to be coached back to his speed-doubles game.
That's not the case with Mike Carp, who sacrified a 15%/18% K rate to go to a 20%/23% K rate and double his HRs. Robinson went from 23%/26% in his speed-doubles phase to 29%/33% in his HR phase, and Taro's right that that's danger zone.