the troublesome competitor Wizz that has lower cost than Ryanair
Until such a stage that Wizz starts needing trade union representation. With all this expansion into Western-Europe and Scandinavia, could come sooner rather than later. It's the only reason in reality why Ryanair set-up Buzz, Lauda, Malta Air etc. so they can reallocate labour on favourable terms and minimise the cost impact of unions. Wizz could be forced to do something similar.