I think the Hub is more of a legacy issue. When Hue was originally released, zigbee was the right technology for the task. However just recently a home WiFi mesh network has become a more robust direction. We will never be able to get away from needing a bridge for a Hue environment that includes the current generation of bulbs, but it is possible that a next gen light could also include WiFi.Just a little redesign can solve the problem, there isn't a need for a bridge other than wanting customers to be able to use Hue as its own standalone environment.
Ultimately the Hub is not a big deal. They are cheap in the starter packs and do provide a consistent base for maintaining schedules and configuration.