For sure the USD is a lot bigger still than bitcoin and will always be cause the USD has been around for so long that it is hard to be competitive against it.
But the bitcoin will become quite big though so who knows BTC might defeat USD one day.
I also believe that Bitcoin is still weak. At this time, the dollar wins. But nobody knows what will happen in the near future
yes you are right bitcoin is still weak because little demand but when bitcoin become famous because has been adopted by bank, i believe bitcoin will much stronger than usd.