You'd only have to pay for cellular data service for devices that don't connect to WiFi. So the only real cost is whatever the modem costs. I think what'll re

You'd only have to pay for cellular data service for devices that don't connect to WiFi. So the only real cost is whatever the modem costs. I think what'll really happen is they'll become always online devices where if you're offline for more than X days they quit working and claim they need an update - please connect to the internet.