In reply to AP Melbourne:
But the key question to ask is, what do they mean by universal language. Does the person think that it can be used for example in a situation if they don't speak french?. Given the small amount of people who do sign its a long shot, even though it is a useful skill to learn and probably much easier to absorb at an early age.
Many hearing people do go to BSL language classes, and it can be good to have, especially if you do end up being able to use it to help communicate at some stage.
Interestingly, the schools I dealt with concentrated on lip reading more for the deaf and hearing impaired kids as they would be communicating more with people without a hearing impairment in life, and thus not have the sign language skills.