Which teacher in their right minds is going to up sticks and leave to go and work in an expensive coastal town leaving their family and friends behind for two + years?
Imagine the pressure of doing all the things you currently do, but in a new school, with no support and being expected to be outstanding every second of every day? What would happen if you had an off day? What about if you were outstanding in a middle class school with supportive parents, but didn't have a clue how to deal with children with EAL or severe behavioural issues?
Who decides what 'elite' looks like? What if you failed? Or decided after 5 months that you needed to leave, but you'd signed up for 2 years!? Is it like the army where you can't leave!?
If it's young ambitious SMT types who she wants to do it-good luck with that. Most I know have escaped from the classroom as soon as they could and haven't taught a class for years; they now enjoy swanning around in very important meetings with their clipboards-many weren't actually terribly good teachers anyway!
What I bet it'll be, is SMT types who are parachuted into these schools but won't actually do any teaching. The current teachers will be expected to spend hours after school listening to them pontificating about what Outstanding teaching looks like in their completely different school and then the classroom teachers will be expected to go and implement it, whilst the super teacher watches with a clipboard telling them where they're going wrong. Super teacher then 'feeds back' to those up high and says the teachers are subversive and won't do as they're told.
I'm sure it'll be brilliant.