There is potential within mainland EU and former eastern block. Surely much of the continued sucess or possible expansion is dependant on the pertinent economies and the condition of the recession or growth. This moning there was a report on Slovenia (re Popes visit) and the economy is in a dire state as it is within many of the eastern block so it may be some time before real growth is seen.
There must be a point at which the LC market customers cannot or do not wish to travel so frequently. The outcome must cause a period of negative growth which a previous contributer has already stated. The problem comes when in this condition what do you do with specific routes and a surplus of staff/ aircraft that cannot be gainfully utilised.
Future issues will arise with the protectionism of the French market and the eventual privitisation of AF, that will see a huge battle within mainland EU for customers and no doubt AF swamping the market when it has to work a lot harder for its business.
Finally I see no reason to doubt that within the next ten years there will be duty on aviation fuel and VAT or an eqivalent tax on airline tickets and this must impact on the industry, not forgetting that one day the railways will get their act together. The loss of a hull or magor terrorism is also ever present.