I think you’re right on with the idea of an Open Source political party, and believe such an organization can effectively address your concerns of “too many voices” and the easily swayed “will of the majority”. The key concept in this idea is decentralization, which also implies competition. Groups which organize with too much commitment to consensus will find themselves outpaced or ignored. Likewise, the will of the majority only matters as far as the power of that majority extends. Push power out from the center, give individuals power over their own lives, and let them aggregate how they choose.