I agree on your "different note". Language is very much related to the culture. Introducing them in other place does not really make sense, other than for the scientific curiosity. There is a reason Esperanto never really took off.

As for your question, if learning new languages has a future, I would say definitely for the next 10 years. Beyond that, it's of course hard to predict. But as you say yourself, language is very much intertwined with the culture... so to really understand a culture, you also need to learn that language. When I was in Spain, having an AI translation tool might have helped me in daily interactions, it would not have resolved the issue that the real interactions and understanding of the people cannot happen without knowing Spanish. Alos, learning a language is fun.