Technically WiFi can never be as ubiquitous as GSM/CDMA due to many reasons (mainly stems from technical limitation). So there'll be quite a lot of areas where the device is not connected to the hive mind (mainly when you're moving about: cars, buses, metros, etc).

Considering how much apps and services that work so much better when you're connected, I'd much prefer if we address the concerns and shortcomings of the more ubiquitous connectivity option... (cost, privacy, connectivity option, etc)