Doesn't this just lead to lowest common denominator decisions? Can Dotmocracy produce innovative solutions?
In fact, because ideas can be presented in written form and anonymously, shy and timid people are more likely to share their unique ideas. Once innovative ideas are posted, if they are good ideas, they should receive a decent level of approval from the participants who recognize them as such. Results will depend on the culture of the group and how open-minded they are to new ideas.
In the end, it's up to the decision-makers whether to safely go with what ideas have the most acceptance (i.e. minimum disagreement), however conservative they might be, or whether to champion more innovative proposals that might have some disagreement but they believe will work the best.