Don't hold your breath
What will no doubt happen is that they'll make you jump through loads of hoops just to report a problem, and never give you a firm date for an installation or changeover. We'll be able to go back to pre BT days, three month waiting list for a line, and then telling you it's your equipment or internal connection that's the problem (and they'd charge you for a callout) just to cover their rear by not starting the "waiting repair" clock.
Really the one that would hurt is being compensated for not being provided with the contracted service, you know the one ... X MB broadband promise but only X/3 MB delivered which seems to be about what you actually get.
Says someone who is not in an FTTC area but they keep promising you the moon on a stick.