It is worth noting that without more regulation crypto currencies cannot legally be used today for micropayments in the US. Right now you would need to track capital gains every time you make a purchase with Bitcoin and file that with your taxes, which is enough friction to make this use case prohibitive when lightning network arises.
Should the US government give a law to enable micropayments, be sure that it will also include lots of other protections for investors. The world of crypto currencies will look very different then.
I do think that cryptos will eventually revolutionize financial systems and current laws around them in the long run, but this will take a very long time to play out, and it will not be without a serious fight. US is unlikely to be the country where all this innovation will happen as the government has a very strong ability to enforce laws.