Iceman. You have a point, of course, but we now have a unique situation in CX whereby we have well over 100 FO's who joined on their Base little realising that Command slots on that Base would only be available in Seniority order having done the 'course' back in Hong Kong. We now have 100+ ( somebody will know the exact number) who have refused Commands and will remain FO's for ever just to keep the Base. If you join on a Base, you should be able to stay there as a Captain but that would cause a riot ( actually it would probably not cause anything of the sort knowing how easily we are all pushed around). Another reason why people stay on their bases as FO is that it takes so long to get a Command course that the average FO's kids are at such a critical point of their education that moving halfway around the world would be so disruptive they chose not to do it - or Dad does.
Anyway, another problem caused and not anticipated by our brilliant Management team who embarked on Basings purely because it saved them money. No thought (except the 'Iceman Principle') was given to doing it properly - hence the various embarrassing debacles that we all know about.