I think that you are right - Aberdeen is going to have problems and the fact that landing fees are going up to £20 is a non-sense. So, for a series of 5 touch and go's the student will pay an extra 80 pounds - almost doubles the cost of the lesson!!! Who can afford that??
So, if you then put on top of that the amount of time that in a lesson you spend orbiting to get back to base that is also unattractive in terms of cost. I am told by friends who have learned to fly in Aberdeen that 15 minutes may be spent orbiting whilst commercial traffic comes in - extra costs+++.
If you look at the runway configuaration in Aberdeen, its north-south and is right across the direction of the prevailing winds - limits the opportunity for flying. On top of that Aberdeen is constantly under the haar isn't it? Who on earth would think that they could make a comercial success out of this package?
The answer - come to Dundee or Perth to avoid all of these things?