I know it is just a joke coin for many people but that joke coin has managed to out perform thousands of coins that actually started out as a good idea project. There are people who think they will solve some problems in the world with the coins they are making yet dogecoin being a joke coin has managed to be bigger than all of them.
At the end of the day, comeback could only be with price as people might imagine but the marketcap is already huge, the price is not because there are tons of dogecoins right now and the price could potentially go even lower with time (don't know how many doge will be in the end). So marketcap will go up, price sometimes goes up but eventually doesn't have that long term possibility.
Many people see Doge is tool to make money and each year the coin will be pumped very high but after that time, Doge will have a lot of price adjustments.