Because demand for dollars is so high. We benefit from having the world reserve currency, so people need dollars. Other countries that have debt problems use US treasuries as a save haven thus creating a demand for dollars. As long as that demand is there we likely wont see the hyperinflation you are thinking of. Of course it is possible for the Fed to print too much even with the demand so high, and it seems they just may do that. The real problem comes when we reach the apex of US dollars in circulation and other countries decide they dont want them anymore, then we wont just see Weimar we will see a catastrophe the the human race has never experienced before.
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