I can only say that during my time so far, those 'trainees' that have got other ideas about their career have usually been spotted quite early on and on some occasions may not receive the 'best' training that may be available. Now- a failed career is definately something you don't want under youre belt . Training is quite a personal thing as unlike the airline industry we see a trainee through all of their on line training and as you would expect, a bond develops and a personal interest grows towards a trainees success or otherwise. We all put a huge amount of effort into training people and trying to guide them towards being a good controller.
May I suggest that you make your mind up which career you want before wasting our time and efforts and blocking another - dedicated applicant from getting a chance.
It does cost a huge sum of money to train you but from an operational point of view there is nothing more demoralising than someone who uses us as a stepping stone to pass the time until their real job hope comes to fruition.