Actually I don’t think decentralized exchanges (a technology) can solve this issue. If you want to operate a business, you have to comply with the law. Cryptocurrencies are a new technology, and as such, they provide a technological solution to the problem of having robust and censorship-resistant monetary systems. They do not solve the issue of government regulation being unproductive or otherwise misguided. Only a shift in public opinion can do this. While we are living in times with a strong anti-government and anti-bank sentiment, governments still do want to know who pays what, so they can collect taxes. This will not change any time soon!