Since the USD is being used as an internation currency there is no doubt that it will dominate the bitcoin trading , but right now the number of bitcoin users and investors is mainly located in chin and central Europe which makes the bitcoin being traded for Euros and Yuan , but there is a large growing number of us users so i think that we might see the usd dominatinf the bitcoin trading.
I think its already been happen right now since we are using bitcoin right now with usd.. and i think the price of bitcoin is relaying in usd.. for international calculation or value of bitcoin.. so yes for me that us dollar was dominate bitcoin trading this year.. and more in the future.