I know it is an unpopular opinion, but I'd prefer everyone to switch to the same language. That would greatly simplify a lot of real-world situations, and increase culture proliferation.
Along the same reasoning, the less active languages there are out there, the better.
I think the unpopularity is more in the practical issues than in the theory. I'm sure everybody would be happier understanding each other, but not if it's accomplished by force or discrimination.
Along the same reasoning, the less active languages there are out there, the better.