I wonder if keeping OR with BT and also allowing other ISP's access to the technology, a bit like it used to be with ADSL would be a way forward.
A bit like it used to be before ADSL seems more appropriate to me.
If anyone remembers "Surftime" (or whatever it was called) back in the late 90s/early 00s then that provides an indication of a possible way forward.
Back then you paid (BT) for unmetered 56kbps access to a certain range of number prefixes (084something ? - can't remember) and you paid a seperate ISP to provide internet connectivity. The ISP had nothing to do with the landline. LLU blew that model apart but unless we're going to have sub-loop VDSL unbundling (lunacy on wheels) then something is going to have to change.
Personally I see nothing wrong with a model where you pay (an "independent") Openreach directly for a data/voice connection (ADSL/VDSL/FTTP) to the exchange and then pay an ISP to provide suitable internet connectivity.
Obviously you'd need some regulation so that Openreach couldn't be taken over by one ISP/cartel of ISPs or compete with those ISPs but that'd be a lot more straightforward than the current regulatory nonsense.
Pick your own voice service, should you require one - ISPs shouldn't be able to REQUIRE you to take their voice service either.
Openreach would make more money (lots more) than it currently does; customers would have a direct contact for faults & retail ISPs (both Sky & BT spring to mind here) wouldn't be able to cross-subsidise stuff like EPL football by bumping up line rental every year.
I doubt anything will actually happen to BT/Openreach. The govt needs them both "on-side" as the bulk in-depth spying envisaged by the Investigatory Powers Bill will be much harder to implement if BT is being "arsey" about an Openreach split.