That is one verse that I think most likely was fulfilled, figuratively in the Early days of Christianity, like the book of Acts, NT times etc. before Christianity broke away from Judaism. (Their are plenty of times when pagans recognized the miracles and Holy Spirit on believers and wanted to be converted)
It is possible it relates to something in the distant future with Israel, but I don't exactly see why God would favor the natural Jew, Messianic Jew etc. over the Christian gentile believer.
I also think there is some idiomatic language going on etc. e.g. - Using 10 gentiles to one Jew etc. Kind of like this verse Isaiah 4:1
Do you mean at pentecost?
Do you think ten people from all the nations means just 10 people or a throng - 10 from each country?
Acts 2
5Now there were dwelling in Jerusalem God-fearing Jews
from every nation under heaven.
6And when this sound rang out, a crowd came together in bewilderment, because each one heard them speaking his own language.
7Astounded and amazed, they asked, “Are not all these men who are speaking Galileans?
8How is it then that each of us hears them in his own native language?
9Parthians, Medes, and Elamites; residents of Mesopotamia, Judea and Cappadocia, Pontus and Asia,
c 10Phrygia and Pamphylia, Egypt and the parts of Libya near Cyrene; visitors from Rome,
11both Jews and converts to Judaism; Cretans and Arabs—we hear them declaring the wonders of God in our own tongues!”
