>>> What is the point in learning Gaelic when it is not widely spoken in the world.
Most Gaelic speakers have never consciously 'learned' Gaelic, Andres. They've simply 'absorbed' it because it's the language that their parents and other family members normally converse in, it's the language that they're taught in at school and it's the language that's used in their local shops, their libraries and their community centres. While they're all able to speak English as well, English is very much a 'second language' in their day-to-day lives.
You might just as well ask why people in Barcelona learn Catalan, even though it's not widely spoken throughout the world. While they can all speak Spanish, Catalan is very much their first language simply because it's the language that they're brought up with and the language that everyone in that beautiful city uses in everyday life.