If dogecon hit $15 in December, the original bitcoin will be 1 million dollars. I think it will not happen this year.
Why? There are more and more USD trading pairs and also a Doge could become 10 BTC or something like that.
(I am not saying it will be 15 dollars, just saying that it does not mean that a bitcoin would be 1 million dollars.)
We don't have much idea about the Bitcoin whether it will reach 1 million dollars or not. Most of the cases people are considering it will reach $25k, there is no exact prediction about the doge price.