Event-driven applications are all around you. Windows and Mac applications are event-driven. Web browsers, as well as most of the GUIs are event-driven.
Should games be event-driven? I think they should – because the event-driven applications are more modular, decoupled, maintainable and upgradeable.
As an alternative for watching a value of some property, objects subscribe to events and react to them. This is known as the Hollywood Principle: “Don’t call us; we’ll call you.”