The odd thing about the position Brzezinski stakes out here is his avowed ignorance of the uses to which vast fortunes might be put. He can't really be ignorant of the fact that wealth is a form of power, can he? Surely not. Which I take to indicate that he has some agenda which he thinks is served by not acknowledging that fact. In most contexts I'd assume that the unspoken agenda is to preserve the privileges of the owning class, but that interpretation doesn't seem plausible here.
Adding: Perhaps Brzezinski's agenda has been revealed here:
...the left’s agenda goes considerably beyond a black helicopter-based global monetary system. The ultimate aim is to establish a Star Trek-style post-capitalist society in which there’s no currency whatsoever. |Yglesias|