Yes, That's the way the world works. We can't know the specifics of the future with any certainty.
No, no, no. That's not what I mean by uncertainty in the future. What I mean is that the current state of Bitcoins in the present has a certain amount of uncertainty associated with it based on the dynamics of its supply. To individuals in the far future, which will be their present, they will view Bitcoins with a much greater degree of uncertainty than we do, again due to Bitcoins built in rules.