Why would someone like to learn a dead language? Have you ever met or heard of someone who's learning Latin or Ancient Greek? If you're a university student, then you're probably one of them! Latin and some of other dead languages are still taught at universities. There are in fact many people who are trying to learn them. They may be interested in ancient cultures, or else they want to know the roots of some languages we use nowadays. What other ideas do you have? Why can it be useful to learn some of the dead languages?
At the present, learning languages, even if they're dead, is really easy and fun because there are so many online recourses and e-books that can help you in learning!