If we were to talk about the next 5 years - would you expect the entire UK to be able to be able to receive some sort of fibre service? (FTTC/FTTP)?
BT's current plans are due to complete around 2014, and that is only for 66% of the country (population). I suspect that those plans leave out 4 categories: Some of the "exchange-direct" lines that don't go via a cabinet (some will get FTTP though), the marginal (profit) cabinets in converted areas, the marginal exchanges, and the hopeless exchanges.
BT would take the BDUK funding, and use that to get to 90% of the country (population). I guess they would cover more of the marginal cabinets & exchanges, but still not cover either the exchange-direct lines or the hopeless exchanges.
Those exhange-direct lines that don't get FTTP and are close to the exchange wil be able to use bonded ADSL to get superfast speeds. The direct lines that are really long might needed a bonded solution just to get the 2Mbps minimum.
That leaves the hopeless exchanges - where different technology might be needed. Mobile (perhaps using some freed-up TV frequencies) or Satellite seems the most obvious.