For a decentralized currency, the limited supply is the only value proposition that made it viable. Otherwise the currency itself becomes flooded by mining rather than purchased with other forms of currency, which leads to more miners trying to cash out than people trying to buy in, which leaves the currency itself into a constant, downward price based on sheer supply and demand.

Any type of currency that doesn't have something limiting the supply (not fixed, but at least constrained) becomes valueless by default.

Even if Bitcoin is limited, if cryptocurrencies themselves are not then we're all just giving people a license to print money.

At least with the Federal Reserve there is a governing body limiting the supply of new dollars entering into the system.