The given answer depends on the point the person is at.
If he wants to buy your BTC cheap speculating on a rise, he might act otherways then telling you straight out -> yeah it will go up.

In a way - noone knows - everything is speculation, but i see bitcoin as the petrol of our time...  
But it might also go down the Drain and we loose out asses  

We´re in the Darkage of something big - which may happen - but its not forced...