Even though any scale of people want to weigh in on any decision they care about, the quantity of decision makers is far less significant than the quality of the process.
Any individual or group working from the wrong questions will not make good decisions, good defined as wise and well-timed. Even one person or a few can make good decisions in behalf of many when they work from the right questions. It's not how large the decision making table is. It's about how good the questions are that inspire, shape and engage the process.