The biggest open world game could be the real world simulation

Here's a interesting idea that perhaps could be the future of gaming - simulating the entire world online.
London-based virtual-world-simulation startup Improbable has a mission to create a platform upon which developers can build vastly more complex worlds, sprung from frustration at running up against the limitations of online games.
http://www.wired.co.uk/news/archive/2016-01/12/simulating-the-real-world-online