Bitcoin is open source and its design is public, nobody controls or owns this cryptocurrency, and anyone can take part in it. The significant increase in the price of Bitcoin in a short time made the Bitcoin/Dollar parity popular among active investors and traders in a short time. In addition to its many unique features, it excites its users with a payment method that cannot be provided with any previous payment method.
Honestly it could be anything, it could be 100k by the end of the year, it could be 20k by the end of the year and I doubt that any of us will be shocked by neither of that neither. If we are talking about going to 100k, that is only 2x and bitcoin going 2x is not surprising, it is something normal and seeing how bitcoin keeps making 2x constantly in history and expected to do so eventually again (100k will definitely happen, just don't know when) then 100k will be something expected as well by the end of this year.
However we have seen it crash too many times as well, from 64k to as low as 28k at the bottom, we all remember that right? It was just a few months ago, so from 50k to 20k? That shouldn't be surprising neither, it has done that before and it could done that again. Which is why there is really nobody that could tell you what it will do, only what it can do.