Emancipation would have happened and did happen not because one person decided it was the right thing but because those that believed in the idea of that person made it happen.
The founding fathers could not have chosen direct democracy for several reasons. One , the idea had never been tried anywhere before, it wasn't even a concept invented at the time. They began their discussions based on what they were familiar with, monarchy , and how to improve it. Two, the general public were extremely illiterate at the time and could not understand concepts of things like budget and defense . Third , communication with masses of people would have been impractical at the time, it would have taken years to tell everyone what was going on and to get their input.
What is so wrong with something like a state taking a vote among its taxpayers as to whether a state passes a bill ? They are the ones paying for it, so shouldn't they decide if it is right for them ? When they vote someone into office is not the person they elect supposed to be a proxy for those voters ? How is it fair when the official does what those voters do not want ?