Though I take your point that players are not often great GM's, I have hope for Kerr. A few points:
1) Isaiah has been a great evaluator of talent both in NY and in Toronto. Let's remember that his draft picks this year were roundly booed, and both turned out to be quite good. He's just not been great at putting together a team.
Unlike Isaiah, though, Kerr has the advantage of working with the ultimate team coach in Mike D'Antoni. I trust D'Antoni to keep Kerr focused on team needs.
2) Great players make lousy GMs. They can't understand why the players they assemble can't do it all. After all, they could.
Kerr was a great presence, a wonderful person, and a great shooter. But I don't think Steve Kerr's *mother* (and, knowing the tragic situation of his father, I use that word carefully) ever thought he was the best player on the floor. Kerr was a cerebral player. I have hopes he will be a cerebral GM.
I don't want to guarantee his skill. And the Phoenix GM will have the unenviable task in the next few years of replacing Steve Nash, a great player who makes his teammates immeasurably better. So Kerr is set up to fail.
But the article was about one of the best GM's in the game, and detoured into badmouthing Kerr. I don't know how good he'll be. But neither do you. At least give him time to fail.