I'm not just saying this because I'm running for Congress (NY19) on a blockchain Direct Democracy platform, but I think we will still need Representatives if we have a Direct Democracy. Someone needs to sponsor the bills that come up for a vote. Someone needs to make sure the bills don't violate the Constitution or conflict with other existing laws. But with Direct Democracy, Representatives will not be able to sell their vote and the kind of people who end up representing us will be less corrupt. If we had a Direct Democracy we could vote no to every bill Congress brings to the floor until they start bringing bills that make sense. You ask above about the possible problem of the tyranny of the majority. Having a government that includes a (very limited) role for Representatives helps avoid this problem. I also think that the majority view is more of a problem when people vote only on Representatives, not issues. They end up voting for or against a personality without taking the time to understand the issues. You won't have that with a Direct Democracy. https://directdemocracyus.org/alexander-for-congress-2018/