Yes, I totally agree with your statement "Future of Bitcoin Economics depends on mass adoption of Bitcoin. No body can predict accurately the true future of Bitcoin."
We are just betting on its future, we are investing because we believe the price will rise like we see now.
As more people will adopt the price will move up since the supply is limited in number, I like this investment as well as it's not controlled by
anyone and we are given the chance to trade due to its volatility.