If it's only 1 USD, it's still rational to be able to reach that price. And what is irrational is that if DOGE in the next 2 years has to reach 100 USD, that is absolutely impossible.
As far as I know, the effect of the Bitcoin Halving will impact the price of all altcoins, including Ripple coins which could reach a price of 1 USD, currently the price of Ripple coins is around 0.55 USD.
My calculation is that when the Halving occurs, on average all altcoins can reach 100%, especially coins that have good development can increase more than 100%. I'm sure Ripple can reach 1 USD someday after the Bitcoin halving. IMO