https://www.youtube.com/watch?v=EQK9m_OBVgY
>The US military has sunk $50 Billion dollars into this problem over the last 30 years and still aren't there.
Bell X22 ( https://www.youtube.com/watch?v=arXpHn9DPYo ) was technically pretty successful from the start. The only disadvantage vs. V-22 is the speed - that speed though comes at the cost of lesser stability and safety and higher complexity of V-22. For commercial application the priorities would be different, and thus i think the multirotor, being more easy to develop, would come cheaper and sooner than that while any commercialization of V-22 is doomed from the start.
