There is now every reason to suspect that the Fragrant Harbour will come under Mainland Chinese Rule, much sooner, than later.
Mainland meddling with or influence over Laws governing Hong Kong, will eventuate in airline and shipping traffic through the port to rapidly diminish.
Cathay Pacific raison d'être for being based in Hong Kong will become rather problematic for the Swire parent and in turn CX employees.
Also, Cathay Pacific's continued existence in Hong Kong along with its "Freedoms of the Air" rights were and are included in, and subject to the Basic Law (Constitution of Hong Kong) and interpretation of the Rule of Law being based on the Western System of Law.
Interfere with any of that Constitution and poof...all expectation, confidence and trust will be gone.
Now it is just not a matter of if, but when..?