[VivaLFuego]

^bearcat raises good points. It's not that the money to build this is impossible to conceive (since in many ways it is actually functional), but it's incredibly complex with many stakeholders, so working out the legal aspects of a funding deal would be a multi-year project in its own right.

Of course it would still need some public subsidy, but the revenue-generation and potential for private funding a la Millenium Park could probably go a long way towards making it a reality if it had a champion in government who could ensure all regulatory approvals are granted.