Bitcoin's dollar value may go to 1000$ or 1$ but its real value to humanity is infinite!
What you're saying is very similar to the intrinsic value argument of some gold owners.
Of course it's useful to us, but that doesn't mean that it's useful to "humanity".
Im talking about using the bitcoin protocol for messaging, voting and trading.
Gold is a good way of storing wealth over long time but you cant use gold for encrypted messaging or secure voting...