The oil reservers around the world is full.
There is all ready too much oil.
The USA dollar demand was coz of oil.
USA dollar have problem now!!
USA dollar was backed by oil Trading!
Now When oil is down in order to keep USA dollar as Reseve currency they need to Back up USA dollar with other things
Dollar demand caused by overall usd usage around the world and also caused by latest usd printing - people still pay for things, thus value of money is still there.
Of course it is temporary, but my point is - its not all about oil