People have different point of view regarding bitcoin's market value in the future. Predicting it to reach 20,000$ in 2 years is not so surprising market value since others are speculating it at 50,000$ by next year.
So you really think that it will make more than x8 in less than a year? It is impossible my friend, unless that all the major banks of the world, including the IMF, put all the money that they have together on bitcoin.
So, it is unprobably going to happen, anyway, $20,000 is possible, only that it can happen in a few years from now