Prediction should be made by observation. As you have said about the demand and supply. Dogecoin have unlimited supply. More than 5 billion dogecoins will be added with the total supply of dogecoins at each year. So, the demand won't be able to help dogecoin to increase in price largely. Dogecoin price to $20k is out of imagination. And everyone can observe it easily.
Yes, that's right, making predictions on dogecoin is actually a bit funny especially for $20K, because dogecoin never hit $1 at ATH this year so it would look funny when someone predicts the price of dogecoin for $20K, obviously that's beyond imagination
If you consider doge as a meme coin then you can predict any price as your wish, nothing wrong here. Meme coin means to be fun, don't take anything seriously. Dogecoin almost touch $1 but due to enter bear market mission to $1 Doge were not fulfilled. $20K beyond our imagination but indeed this is way we get fun.