Well, i think people can guess it about only and nothing else. Actually, we discuss with each other and see the price up and down, than we can predict about the price of bitcoin. Now you can see no one know about the future, but Why we call that bitcoin is a future currency? Because we see the present is very well of Bitcoin.
No one can predict what will be the price in future and whether it will go higher or lower so whatever scenario we come across through we need to take actions accordingly, if price falls better to buy them and sell them when its allowing you to make profits and keep on repeating the cycle in future too.
If no one can't predict than what the reason to buy the bitcoins?
When you realize now the time is coming of bitcoin's price would be grow, than you buy the bitcoin and save it for the price increasing, It's mean you can Guess or you can say that we can predict So that's why you buy it. Otherwise can you tell what the word? we should use it.