Uni is worth it if you have a specific career you are aiming for which requires a degree, and if you are doing an academically rigorous subject at a well regarded institution. If you know from the outset you want to be a pilot and have funding in place I would suggest just going for the training straight away as a degree won't necessarily make you more employable. In the UK at least the graduate jobs market is so saturated, and tuition fees so high, that just going to an average uni and getting pissed for three years is an expensive waste of time!