Bitcoin was a revolutionary advancement in that field since it was both decentralized AND was the first major use of a blockchain. It would have the same uses as previous digital currency, but without the shadier aspects of them. Then you also have to consider that a wide number of cryptocurrencies and tokens have ended up being used in serious applications by major business. I think something like Ethereum for instance was inevitable.
So what you'd have is reduced institutional investment by the groups funding large-scale crypto mining or directly buying crypto, but certainly there'd still be plenty of interest from the tech community, criminal activity, smaller investors who never minded the volatility (and here I think the price of bitcoin would be more volatile), and eventually a lot of the tech behind cryptocurrency would reach businesses.