How many of the current YMEN users will be prepared to move down SE? YMEN is a good central location and the last thing we need is the likes of PolAir, Air Ambulance moving into YMML which will just mean more delays and chaos for everybody.
All well and good to have airports out of town however people have to be prepared to use them.
For large International Airports it's works but for mixed GA, location close to a CBD is paramount.