How much juice do you really think there is left for Doge? Yes its possible for $1 however keep in mind that for Doge to stay at $1 it will need $500,000,000 worth of buys to offset the new mined coins per month, do you think its sustainable. I don't think so.
Even if it does go to $2-3, it will be temporarily and will come back down. The issue will be if there is a bear market there will be massive selling and people will all run for the hills and Doge might see a 95% loss within a year or so which is what happened with most alt coins in 2018.
Can they still realistically change the emission curve or eve switch to POS? Anyone has an idea about their hard coded rule set as to when they can fully transition to a new schedule or eve POS with a hard fork?
I am not into DOGE's technical details, but that would probably be big news one more time and give it another push. Apart from that $500,000,000 is certainly not sustainable.