I thinkdUS dollars is the most strongest currency in the whole world and as we know that business through the whole world are doing in US dollars so its strong thing for US $ that it will release its value until world start business in other currency and i think in coming 10 year its not happen.
 Now a days US $ fall value and the reason behind is US election due to which there business are disturb. I am sure that it will now again get its increasing graph in coming few months.