It isn't going to be "run" by social enterprises. It's going to be run by GPs (whom, by most accounts don't want the hassle). The definition of run is "who signs the cheques"
I work for the NHS, and, I don't care if its privately owned, so long as has previously been noted, its still free at point of use, and I don't need private medical insurance a la USA.
It might be a good thing for services (and I might get paid private sector salary *cough* yeah right *cough*). More competition etc, driving the costs down and efficiency up. I agree that most of the NHS is full of Management bloat that needs trimming down.