If you want to see what it will be like when WiFi hotspots can be found almost anywhere, just check in for a night to any of the low end motels (e.g. Holiday Inn Express) that offer "free" WiFi.
What most of these places are doing are buying a cheap DSL line, sticking an access point on each floor, and hanging a banner out front (High speed Internet!). It's not high speed when every other guest in the hotel fires up their laptop at the same time and tries to download movie trailers.
Even emerging systems like WiMax, which has more bandwidth, is subject to the same problem--put too many users on one access point, and it's like being on an old-fashioned party line--you have to share with all your neighbors. All that bandwidth gets divided up, and not equally; it is more like first come-first serve, with bandwidth hogs getting a disproportionate share.
It is the tragedy of the commons, writ small.
We'll all have wireless devices, but trust me--we'll all want fiber to the home, too.