I agree Fuchsia should prevail. My reasoning is that, presuming it succeeds technically, it could only be killed politically if both Android and ChromeOS preven

I agree Fuchsia should prevail. My reasoning is that, presuming it succeeds technically, it could only be killed politically if both Android and ChromeOS prevented Fuchsia from being used on first party devices. This seems unlikely. Google projects that get killed are either retail products that gain insufficient traction (for Google) or expensive projects that stall for technical or logistical reasons.