Long term it is clear that optical fibre is the way forward to deliver multichannel on demand and personalised services to the home. No radio or satellite technology can compete on a truly large scale. This means that BT is strategically placed to benefit given its existing infrastructure and ownership of poles, ducts etc. (the largest cost element in installing cables and fibres is digging the trenches and doing the "civils" part of the job).
For companies such as Virgin it makes sense to compete in large towns and conurbations but beyond that BT has such an advantage that they will clean up (regulator permitting).