Re: Excellent if it happens...
that's not much of an answer, Mvnos would not exist if this exclusive access as you put it key to provisioning coverage. the profit is probably not worth the technical trouble as well as having to get together and talk. They'd never agree to a rate on their own. May also need cell handover threshold tuning. Blocks of minutes might be a way to do it.
My point is it isn't loss making as such, and worse case needs additional coverage deployments. Both are customer wins, and push operators to do what they should be anyway.
The operators' non responsiveness says it all I think, they normally cry and wail when such things are announced, but they're quiet this time.
I hope this happens and makes operators fix their shoddy data coverage, some squatting on prime spectrum (read O2 and their gprs). It's sad that places in the east have leapfrogged ahead on coverage while the UK lags behind.