The video is impressive and I genuinely hope it gets built. If it's successful, these sort of projects can become the blueprint for others to follow.
So far though, the people making the money are the architects (the video being the modern equivalent of guys in black turtle necks building models out of balsa wood), planning consultants and the various consultants producing specialised reports on flooding, transport etc. It wouldn't surprise me though if the architects are still wearing black turtle necks and building models.