That is an ambitious estimation 
1000 years is a long time and none of us will get the chance to validate or invalidate your guess
It will however not go to $20,000 that is for sure and you don't need to be particularly smart to know that. If that happens the world has a lot of other problems that's guaranteed.
I can understand people making predictions that go beyond their own life when it comes to the technology but when it comes to the markets what is the point of predicting a price when there is no chance we are going to see during our lifetimes? Dogecoin is not going to last that long, it is likely it will disappear on a few decades once people realize the market of altcoins is a waste of time and that they should have kept their bitcoin instead. 1000 years is a long time and none of us will get the chance to validate or invalidate your guess It will however not go to $20,000 that is for sure and you don't need to be particularly smart to know that. If that happens the world has a lot of other problems that's guaranteed.