1 Dogecoin= 1 USD is a long way to go , we are 1/1000 right now . 1 USD is almost equal to 1000 dogecoins and I don't think we can achieve 1 : 1 ratio too because a lot of traders who just sell a large amount of dogecoin for small profit .
Perhaps because the price is so low now.
Price increase by one satoshi already gives a good gain in %.