Decide what you really want to do, if it's to be an airline pilot then where there's a will there's a way just don't waste my valuable time and an important slot in the training system in the process.
But that's the nature of the beast in training, instruction and education of any kind. Think of the regional turboprop operators that train new First Officers knowing fine well that they'll disappear at the earliest opportunity.
Every production process has an element of waste and training/education are no different.
Just because one can't commit to a lifetime in the same job, doesn't mean they are not entitled to trying. It would be a boring world if when we're 16 we all knew what we will be doing for the next 40 years.
Just because NATS is a higher profile employer than a call centre or McDonalds, doesn't mean there can't be an element of waste in their training process. I've met lawyers and GPs that after years in the profession left it and started flying. A job is a job and fortunately we are still free to choose what we do with our lives
Ivor