Don't forget Virgin!
Personally, I'm more interested in making Virgin/Liberty unbundle THEIR fibre network. You don't have true choice and competition until the ISPs have choice in network provision. In my road, for example, BT won't enable the cabinet as the road has Virgin cable so it's not profitable to do so, but I don't want Virgin as they don't offer services meeting my requirements...so I'm screwed until I move. :(
Having two wholesale providers should drive some actual competition and innovation rather than relying on BT's bloated mass to get around to providing services as and when they bloody well feel like it ("and we should be grateful for it too"). I suspect we'd have got fibre far sooner (and without them requiring large subsidies to do so) if everyone started getting their internet via a NTL (as it would have been back then) as BT started losing more and more of their appalling line rental fees as people switch to another wholesale fibre connection.
Just look at the choice you get from ISPs thanks to LLU unbundling...