A careful analysis of the context of John 12:32 yields the strong probably that the "all" here would be meant as both Jews and Greeks. In other words, beyond the bounds of Israel. Nevertheless, this inclusive group still needs to be drawn and called.
My emphasis was on "who" does the drawing (from the point in time of His Cross and forward). Jesus said, "
I... will draw all
to MYSELF" (my point had to do with the "chronology" that is so often disregarded and overlooked).
I believe it is
the same for Romans 9, in view of what
Romans 11:32 says, "For God hath concluded them
ALL [Jew AND Gentile alike] in unbelief,
that He might have mercy upon ALL [Jew AND Gentile alike!]"... but this is to consider
Romans 9:18 in its proper context, where it had said, "Therefore hath He mercy
on whom He will have mercy, and whom He will He hardeneth." [the overall CONTEXT of Romans 9-11 being "nations"... "Israel [singular nation]," and "Gentiles [plural nations]"... and this understanding carries through to our grasp of "eschatology" (I only mention this b/c you and I both agree on "pre-trib"... but "pre-trib" is not really a thing apart from grasping this distinction between "Israel" and "the nations/Gentiles" (here in this context) not to mention also "the Church which is His body" (wherein there is NO distinction, in our standing before God "IN CHRIST")]... IOW, the "on whom He will" (9:18) has to do with
their idea that the Jews were "IN" with God
by reason of their birth/heritage (
them, and them alone! no one else!), but Paul is saying,
who are you to say that God cannot have mercy on the Gentiles IF HE WANTS TO (and such was indeed His plan!) The "understood question" underlying the CONTEXT being,
"what of the promises made TO ISRAEL?!" (now; ...where are they?! [Jesus died, and...??])