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Especially telling about Greenwald's post is how his last paragraph makes the bizarre claim that the telcos would cooperate where necessary because they are legally required "to cooperate with legal surveillance."
The "legal requests" that Glenn is referring to need to be submitted to the FISA court. This is spelled out clearly in the FISA law (and updated by the Protect America Act). As long as the conditions, defined by law, are followed, the telcos are required to cooperate.
So what's so "bizarre" about Glenn's claim?
That you would write this indicates that you aren't too familiar with the specifics of the warrantless wiretapping issue.