I don’t believe wireless and fiber will ever really compete. I think there will always be a place for both. They both have unique attributes: wi-fi’s portability, and fiber’s speeds. Each has it’s own place – they compliment each other.
The main problem with wireless – at least at this early stage of the game – is that it just can’t provide enough bandwidth to effectively compete with fiber.
I haven’t really kept close tabs, but it seems like most of the metro wi-fi projects are advertising speeds ranging between 1-3 mb/s.
Now 3 mb/s may be just great for web browsing, email and light gaming (assuming the latency isn’t too terrible). But that’s about it. I wouldn’t go downloading the latest Linux distros or anything on a connection like that. Much less downloading a movie or loads of mp3’s or programs.