The only way this would ever happen is if MAplc buy Woodford before Jones Homes et al. get their hands on it and MAplc convince the Highways Agency that the Bramhall By Pass could be used as a "Toll Taxiway" (once the bridges have been removed of course).
Then Manchester could operate Woodford as a low cost airport called "Manchester South" or "Leeds/Bradford West".
Whoever set this rumour up needs their head examined - surely there is still excess capacity on Runway 2 and I can't see the good burghers of Wilsmlow, Mobberley etc being pleased about this.