Litefoot1,
While I respect your view that it is a 'nice airport', my experience was marred by my first impression. Grim, old, forgotten. It struck me as being so starved of investment and one that was totally unsustainable.
This is a sad day for the airport. It's future as far as I can see will be best served by maintenance, freight but not passengers.
As you rightly point out many of the outlets will not be sustainable with the new low levels of passengers. These outlets will aim to reduce costs to survive and likely further depress rents collected by the airport. The writing is on the wall and with a high proportion of FR's business going through GLA, I can't see how the situation can be recovered.