It certainly had its naysayers, but learning a second language is shown to improve empathy and cognitive abilities in children.
Certainly there's an argument to learn something more practical, but at least Gaeilge acts as a bulwark to the onslaught of English language media from US/UK that could easily drown out a small open country like Ireland's indigenous material.
Which subject do you believe should have a higher priority than defending the cultural identity of a nation?
But those are already taught as the central subjects, aren't they? They are far from being ignored or neglected.
Again, which subjects should be prioritized offer cultural identity?
Do you understand what "protecting the culturage identity" means? From your comment, it looks like you didn't manage to connect the dots.