Wireless is definitely different because there is only so much spectrum real estate in the wireless world. As more dumbphone users move to smartphones and other mobile devices become ubiquitous, the carriers will have to manage the spectrum more carefully than for landline. It's already obviously a challenge as caps are starting to appear.
I'd bet long term the carriers will be adding more WiFi sites (or partnering with existing WiFi providers) to supplement 3G/4G. We might even eventually see 3G/4G devices force to WiFi if it sees one it can subscribe to. It's unfortunate that WiFi would have to be part of the strategy but I don't think they have other options.
Carriers will figure out how to squeeze more out of available spectrum, but probably not faster than the growth rate of users and rate of mobile content pulling more data. IE, Netflix/Hulu are coming to phones/pads.
The carriers are the ones pushing the smartphones despite there complaints of capacity. I don't feel sorry for them pushing to sell phones on spectrum shortages and backhaul. They need to put those profits back into the network not bitch about what we do with the phones they sold us.
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