Bitcoin is a completely asinine idea and it will inevitably collapse. It's a currency not backed by anything and has no inherent value. The US dollar, by contrast, at least has public faith, government adoption, and trillions of it circulating throughout the world and thus maintains a pretty stable value. Bitcoin's only purpose is to either treat it like an investment (whose value is solely driven by speculation) or to try and circumvent law enforcement by using to engage in illicit transactions and criminal activity.
On the other hand, there are plenty of cryptocurrencies, and I imagine that outlawing Bitcoin might not accomplish a sufficiently socially beneficial goal to justify the expense in public resources combating it.
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https://www.bloomberg.com/news/videos/2017-11-29/joseph-stiglitz-bitcoin-ought-to-be-outlawed-video
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