Is your Bitcoin really worth "x" amount of $$$?
What happens if lets say 5 big Bitcoin holders were to flee the market today?
Are there enough buyers to inflate the price back up?
What if a run were to occur on Bitcoin?
Do you think that all investors would get the same amount of money for their coin?
This is how market works, u can't predict it, u can never know for sure.
But bitcoin is worth a lot of money, even if not current 780$, maybe 400$ or 1300$, its always worth as much as someone is willing to pay for it

simple as that.