As far as I know in the last biggest increase of Bitcoin's value it doesn't affect the price of Dollar that's why it still stay it's value in it's lowest price. And I think dollar can only affects those currencies that are not connected to Cryptocurrency like those government's currency that has a regular value in any country.
In my opinion, USD has nothing to do with bitcoin, because the price of bitcoin is affected by business transactions in the bitcoin market where demand and supply create prices.
While the USD is only a benchmark of the price of bitcoin, because the standardization of the USD applies throughout the world, and all countries recognize the USD currency.