The iPhone data plan which enables WiFi on the phone will be $100 a month. See it for yourself.
http://www.wireless.att.com/cell-phone-service//cell-phone-plans/data-connect-plans.jsp
I don't see why anyone would complain about monthly fees if they are buying a $600 phone. I would imagine the iPhone will be over $100 a month once you factor in voice time and a data plan.
I don't use the internet on a phone so therefore I will just stay with carrying a RAZR and an iPod Nano. Sure all my friends won't go...WOW...look at how cool he is with his iPhone, but once you turn 30 things like that don't matter anymore.