The signals are becoming more frequent with some coaches, so the infrastructure is certainly appearing.
It is probably already useful for utility purposes like determining telemetry data of a coach wirelessly (e.g. statistics, power, mechanical status, sensor status, digital announcement signage, etc). Maintenance staff using wireless devices. So there's value-add to GO maintenance even if they never use the WiFi for public use.
But it'd be nice to see the signal being used for Internet too. LTE works well, but that signal often gets overloaded on an overflowing peak-hour train using over a thousand devices simultaneously, cramming the same airwaves.
Hopefully they get some good backhaul at peak.
Like combinig Rogers, Bell, Telus, Satellite all
simultaneously.
Multi-backhaul via all-LTE-networks via a bigger amplified backhaul antenna outside the signal-killing Faraday Cages of GO coaches -- some commercial WiFi vehicle systems can backhaul over Bell and Rogers simultaneously (plus, say, 2 other LTE carriers, plus satellite too, whatever signals are strongest at any particular time along each GO route!).