I think your ideas are possible but would be unwieldy. Obviously at the state level there are ballot questions on many topics. The old joke from California is the voters will always vote for lower taxes and increased services.

My biggest concern with your system is having an adequately informed and engaged electorate. There is no way that 99% of the American people would have the time or interest to read a 5,000 page piece of legislation, such as the recent omnibus bill with stimulus spending. Who would craft the bills for people to vote on? What sort of spending and influence campaigns would exist? Is there evidence that the outcomes wouldn't be as thoroughly shaped by wealthy corporations and special interest groups as in the present?

I completely agree that the Electoral College and Senate as constituted are antidemocratic. Yet as long as we remain stuck in ideological thought bubbles we won't have the chance to truly understand other's perspectives and craft true compromises and positive change. For now I think more work at the local, state, and regional level may be necessary to reduce the importance of national elections for solving problems close to the people. It is very difficult.