It isn't bigger than it can sustain so long as a glowie leads it. Reminder that Niantic's CEO, former glowie and founding CEO of Keyhole (which was funded by In-Q-Tel, a CIA [yes that CIA] venture capital arm) is in charge and previously developed Ingress, a "game" that took detailed gps data and basically was an AR game around taking photoes of building's interior layouts with more points for places they didn't have data on. Niantic is in no danger as long as it keeps harvesting real-time location data and photographs of the layouts of buildings.