I’m sure the Pope would love an Esperanto Mass as well as one in Ebonics.
Latin was used, brilliantly, across the entire world so that no matter where one visited or lived, an individual could understand it. Why this is so difficult for some post Vatican 2 Catholics to understand, is beyond me.
Of course, if the Pope is right, there are many young people who do get it and want the Latin Mass.
There's no "culture" of Esperanto...it was a rather optimistic proposal that never really got off the ground. English is far, far more of a universal language that Esperanto ever was.
And I'd be careful about "spoken by almost no one". At our parish we speak it, and sing it, and pray it, every week. Liturgical languages do not have to be spoken *in the home* at all--in fact they are often not. I doubt Egyptians are speaking Coptic or Ukrainians are speaking Old Church Slavonic.