Signs of the times in US cable – Comcast may soon have more internet than TV subscribers; Cablevision plans to prioritize WiFi over the TV business because of the latter’s rising costs and falling margins. That will make the cable providers even more determined to invest in a wireless network they can control – WiFi, rather than cellular MVNO deals – in order to fill out their quad plays, tipping the mix of those four-way bundles towards the higher profits of wireless data, and stealing some of those profits from the mobile carriers along the way. Cablevision, as so often with US cable WiFi, has led the way in disruptive launches, even though Comcast is the biggest deployer of hotspots…