So what about the customers?
If we're looking at VOIP and digital-only to the premises, who's going to pay to make my analogue interfaced cordless system a VOIP compatible one? Who is paying for my mum's new digital phone? Physical lines and infrastructure "owned" by Openreach are one thing, the millions of pounds of existing analogue hardware owned by domestic customers that would need replacing is another.
Perhaps there'll be a ten year gradual changeover period like DTV?
Thinking about this needs ...