The trend is that wealth inequality will become almost the same as IQ inequality. IQ is more much important today than a generation ago in influencing individual economic outcomes. 100 years ago in an economy dominated by manual labor, the difference between a 90 IQ and 120 IQ wasn't that important, but now it is.
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Where did you get that? As far as I've read, most studies find very poor or no correlations at all between IQ and wealth. And that's striking, given what you'd expect from a metric that measures IQ, isn't it?
In fact, those same studies often identify other factors. Interestingly, your parent's class is a hugely important indicator. Sociologists call this phenomenon social reproduction, and it essentially goes against the ideals of the 'american dream', where one can get ahead through hard work. In reality, socioeconomic mobility is quite poor, particularly in the US, which would explain metrics like IQ not being one of the foremost factors in determining wealth.
I would agree with you (not on the basis of data but merely by assumption) that IQ today in a mainly services economy is more important than 100 years ago in a mainly manual labor economy.
While I agree that a higher IQ does not nessicarly equate to high wealth every source I could find in a quick Google search seems to show a near linear correlation between IQ and income. I'd say this backs up what the GP was saying. For most very "wealthy" people it is built over many generations and passed down.