Of course you can't, they're just guessing. If anyone can guess the future price then they're just guessing, I've read a tweet made in 2014 that 2024 price will be $100k, of course if we were in 2014 when the price was around $300 would laugh and think he's crazy, but now everything that is guessed might happen, but guessing the future price is of course something that anyone can do.
Yeah, what they do is "wild and educated guesses", others will back it up with their technical analysis and drawing lines, and we all know that in guesses, sometimes you gonna get it correct and maybe most of the time it will be wrong.
And unlike traditional markets, bitcoin market is still very fairly young, so very difficult to extrapolate data and come up to a conclusion. Plus market is open 24x7 and it is global trading, so a lot of things can happen that's why it's very volatile and fluctuates every hour.