Future of Bitcoin Economics depends on mass adoption of Bitcoin. No body can predict accurately the true future of Bitcoin.
True, it depends on mass adoption of cryptoworld itself that would make crypto projects more mainstream. Then it would require a medium of exchange for investment and other purposes which brings Bitcoin possibly into picture.
Papa Bitcoin will die, if new awesome alternative with huge technology will come and change it... but now crypto is only at the beginning of this road, so for sure it will develop and live.