Yes, I agree however I would argue that the USD, as the world's reserve currency, does affect the people in their day to day lives, but they are just unaware of it. For example, the effect the dollar has against other currencies, does effect very real price for goods, that the average Joe buys every week at the supermarket.
People only really notice the effect during times like the "oil crisis" in the 70's, when Nixon took the dollar off the gold standard, or as you say, during the 2008 financial crisis.
I think the SDR is poised to replace the Dollar, but replacing one debt based fiat currency for another? It's not going to work.
RE: Why don't more people know about the Petro-Dollar and it's pending collapse?