Some level of regulation is needed, especially if we with to see crypto more as a currency. First, cryptos must be very stable(for example tether, which usually stays in the $1 equivalence zone). Regulation will mean that volatility should reduce remarkably. And here is the case market is driven by demand and supply. It becomes extremely monumental to control forces of demand and supply of fixed coin/tokens in a decentralized environment.
I think we can't make it become stable if you mean by price. Because it has depend on supply and demand on the market, so there is nothing to comparing Bitcoin with USD value or any local fiat just if want to be regulate it.
But i was interesting if regulation could be makes in some level, such an example accepting Bitcoin as digital currency with such tax term condition or what about only some fields business that can accept Bitcoin as digital payment likes Retailer shopping, Hotels, travel agent, exchanges currency, etc.