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What if everyone started using the same SSID name, would that be enough to obscure the information?

I don't think so. I think they key off the mac address included in the ssid broadcast, not the ssid name.

Sure, but if everyone in the world renamed their networks to "_optout_nomap" it would work marvelously!

It works off the BSSID (ie. MAC address), not the ESSID (the human visible string).