I do think that LTE/4G will be the way to finally carpet bomb the UK with Internet connectivity at moderately high speeds.

Cable, even fibre, remains costly and difficult to deploy. New build homes and small estates are problematic for ISPs and CPs alike that rely upon, mostly, a single supplier, Openreach, to lay cable to the premises. How much more efficient for the new builds to simply "leech" service from one of the available LTE networks covering that particular area.

I do think that early LTE will transform over the years quite remarkably, similarly as 3G has over the years.