Rumors are flying that Verizon is in the midst of building out EvDO in New York City: NYC will serve as a crucial example of how the higher-speed mobile data networks compete next to Wi-Fi.
Both networks have upsides in the city. Wi-Fi is higher speed, lower cost, and available in many places. EvDO will be lower speed, higher cost, but available in more places (although cellular coverage is notoriously bad in the city). At the end of the day, there's a niche for both networks and if the price is right, enough customers for both.