Does BT’s purchase of EE mean the end of mobile networks?

So BT having originally sold Cellnet/O2 to balance the books have now entered the mobile market again as a network operator as opposed to a virtual with EE as its portfolio mobile offering. While this on the surface may look like a plan to rival Sky and Virgin with the consumer all in offering of TV, Broadband, Mobile and Telephone, I believe it goes much further than that. 

Last week EE announced that it’s customers can now make calls over WiFi, just like O2 customers can with TU GO. I’m pretty sure it won’t be long before Vodafone announce the same. This means that there won’t really be a need for  the home/office boost box as the calls can be routed straight over WiFi using most 3G handsets. BT though have millions of WiFi locations which currently offer its customers use of BT WiFi, formerly Openzone and Fon. Now Fon for those of you who don’t know is BT’s jewel. This is where it lets you use bandwidth on any BT home or business users network without you even needing their WPA password. This means that BT & EE customers will now be able to make and receive calls & data in more locations than O2 & Vodafone put together. 

BT also have the added advantage that for pretty much all broadband installations require Openreach to attend and operate a phone line. The only thing holding everything back for now is that call quality is only as good as the network you are on and too many places in the UK are still offering substandard speeds especially in rural areas. 

I've just taken delivery of a device this morning to help a customer who can’t get a line in at his new premises, but this device can plug in to his WiFi and propagate it’s signal 2 miles away. He can then have the ability to run a VOIP phone system on it without a phone line or WiFi on the premises. It will also provide the same quality data connection speed in his new location. With this kind of tech available right now, the rollout of fibre and the inevitability of WiFi improving all the time, how long will it be before the mobile mast becomes a thing of the past?