For the device to do anything near 1080p with as little latency as possible, the device MUST have a dedicated graphics chip, probably Mediatek or, hopefully, Snapdragon. Also hopefully, it might have some kind of on-board storage, at least for AndroidOS + updates, hopefully a MicroSD port for media sharing. With all of this in place, turning a stream-only device into a regular Android one is pretty much trivial.
I’m not versed in videogame network infrastructures, but wouldn’t be enough just having a load balancer and a couple of instances to ensure “100% uptime”? At least before all instances and the load balancer itself decide to join a suicidal pact, but more instances mean less chance of a critical event happening, no?