For AT&T, purchasing WiFi network is very smart as WiFi is generally cheaper than building 3G and/4G network capacity and more importantly, Wayport already has hotspots in prime areas throughout the country.
In all, this is a good move for AT&T and shows how important WiFi is as a competitive differentiator. For example, in the last few months I have noticed Optimum WiFi has hotspots all over Connecticut. Surprisingly, I couldn't find it active in Manhattan but in CT, throughout Fairfield County you can find pretty strong Optimum WiFi signals in areas such as shopping centers and main roads.
It seems bundled WiFi is becoming a must-have addition and as such this AT&T acquisition makes more sense than ever.