hypnoce
If rules are changed by a fork then you will have 2 different coins. We already saw it with bitcoin cash. Another way would be that the current consensus on Bitcoin itself changes. But that's a risk. How can people then predict such a consensus change. How risky is it to have Bitcoin since the day after the rules may change ?
Bitcoin is not money as we think in a modern way. If you think of money a way to exchange goods then yes Bitcoin is money. Modern money (printed piece of paper labeled in currencies in its materialized form. Just a sequence of digits on your bank account) is dept. That's why currencies have interest rates (IR). It is also possible to create money out of nothing. IR and volume are adjusted according to the economy. Bitcoin is closer to a commodity in the sense that it is finite and requires work to be extracted.