"Currencies today operate with two decimal spaces to the right ($1.00). In Bitcoin, there are currently eight so one could theoretically pay you 0.00000001 or one hundred-millionth of a Bitcoin. Not only is this confusing for consumers, it does not fit in existing systems and software for accounting practices."
So the standard would already have a rounding error of at least $1.80 (0.005 bitcoins). As soon as we go up again, that will only increase...
It seems that you are getting the unit wrong.
The author is NOT talking about going back 3 decimal places, but instead he is talking about going back 6 decimal places. Currently, if my calculations are correct, 6 decimal places would cause a $364.85 per BTC valuation to have an exchange price of $.00036485 per XBT - or $1 would buy you 274.09 XBTs which is 27,409 satoshis.