With respect, I think folks have already told you what they think. My personal opinion is that it is inconceivable that there won't be an airport between Manchester and Glasgow. Are you seriously suggesting that NCL, EDI and LBA will close within a decade? Also that there will be no airports south-west of a line from London to Birmingham? And that Isles of Scilly, the Western Isles and Northern Isles will be cut adrift from any air service at all?
Strange things can happen but I just can't see it.