Security
As you rightly said, it is just wait and see.
Let's also see what people are thinking in this thread!
On the other hand, I work with the husband of the PA of the managing director of London City airport so I asked him to ask his wife what she think. She said that it won't stop the growth and that civil aviation has never been that well. She also think that some of the business travellers will transfer to private aviation (jet rental etc...) might be good for people like us to get our first foot in the trade!