Respectfully. I've been hearing this and other 'comforting' sounds from BT's CEO, their OpenReach area manager and my MP for years. Right now I'm sitting on 25 date shifts. Twenty Five.
I'll believe it when I see it.
Unfortunately, being part of their commercial rollout, BT owe you nothing, it could even be, unlikely I know, that they are delaying enabling the cab to spite you because of your continual moaning and pestering. OTOH, it may be exactly as Icarus suggests.
Remember that there are many, many users who see no prospect of faster broadband in the foreseeable future and others that to get better broadband have had to put their hands in their collective pockets and contribute to the costs, be it an alt net or a community gap funded FTTC cab.