Actually, the main reason for the flight to the dollar is there isn't a lot of alternatives. Sure there are stronger currencies, the Loonie, and the Aussie dollar are the two that are most often touted. But there isn't any other currency that allows the overnight movement in and out of without totally overwheming the markets. Gold and Silver are obvious scale into assets, but a panic will no allow the big money instos to participate, so they nibble rather than lunch on the pms.
One thing the markets and government have proved these last four years is never underestimate the strength of smoke and mirrors.