This is a subject my wife raised recently. I would almost go for it except we have 3 lines that ring into the house 1 personal 1 business and 1 Fax so it is not practical. Plus my current home is virtually in a hole and the cell signal sucks so bad that I have to walk outside to my patio to get a good enough signal to use the damn thing.
For younger kids that are always mobile it makes sense this article in the DesMoinesRegister expands on the trend.