Money is whatever a large network of people agree it is, whether that's stones, shiny beads, gold, silver, fiat, or bitcoin. Market forces decide its value. Increased capital flow into this new asset class and new user adoption pushes its value up. Right now we're in the rapid rise along the S-curve but it won't last forever. Don't wait!
To answer what it's worth, you have to answer "compared to what?" Compared to fiat, bitcoin is exposing how terrible fiat currencies are. They are designed to lose value over time, and to hold populations in a financial servitude to governments and the Banking Cabal.
IMO, if bitcoin reached a static equilibrium (as it will eventually), with the number of users and total capital flow static, it would still appreciate 5% - 10%+ per year compared to fiat, because fiat is so bad. When that equilibrium is reached, my opinion is that BTC will stabilize in the $500k - $5M range.
crypto is the first honest money that any of us have seen in our lifetimes (even gold price is artificially suppressed). crypto is a civilzation-changing paradigm shift and will be the largest transfer of wealth in history from the oligarchs to the crypto early adopters.
Of course that's all just my opinion! ;-)
Shake off the doom-sayers! The future is bright!