No sammy, I disagree with your first statement about that being the question to ask (to some degree at least). Not only is it not required to have been 100% committed to one career path or the other, there are serious questions being raised about the job prospects, which people are rightly asking prior to committing.
Also with regards to them not offering you a firm job, it would be impossible for any airline in the world to do that before you have completed your course. The fact that they are running this scheme is a good sign of their future requirements.
All the airline is running is some support, which frankly costs them very little. The job is not contigent on passing the course, but is just a potential job offer - dependent upon their crewing requirements. That is not very strong in my books, especially not where executives can afford to pay themselves the salaries they do...