It is difficult to speculate. But I don't think their price can reach 50 dollar. The number of Dogecoins and bytecoins in circulation is much more than number of Moneros. If the doge price reach even 1 dollar marketcap will be more than 100 billion dollar and I don't think it will happen.
This is one key thing you have mentioned that is even common to Doge and I don't see Doge increasing maximum in the future unless a further development is taking place on it like we have for ETH but aside that the volume of Doge will always be more than the demand and its usefulness is not being felt rather its being claimed as faucets even coins that came after it have all tuned out to be better.