Jim,
"was his prediction in 1949 about the refugees who had left Israel."
Do you have any basis for claiming this

Yes.
From your post,
"We must do everything to ensure they [the Palestinians] never do return ... The old will die and the young will forget," said David Ben-Gurion, the founder of Israel, in 1949."
It is obvious from the context that he was talking about the Arabs who had left Israel in 48/49.


Just your disgusting invention of an enmity between Ben Gurion and Nahum Goldman - you made it up.

"Did Ben-Gurion really say that? Maybe. It's just that (a) there is no independent verification of the quote; (b) it jibes perfectly (suspiciously so) with Goldmann's own views; (c) Goldmann's animosity toward Ben-Gurion was both longstanding and well known; (d) Goldmann waited some twenty-three years after the statement was allegedly made to publicize it; and (e) Ben-Gurion, conveniently dead for five years at the time of the book's publication, was in no position to acknowledge or deny Goldmann's veracity."
http://www.jewishpress.com/indepth/media-monitor/the-goldmann-paradox/2013/08/21/

"Remember that the far more numerous Jewish refugees who had been thrown out of Arab states were given no hope of ever returning."

It is a fact that many more Jews than Arabs were displaced in 1948-49
Now there are no displaced Jews because Israel settled them all, but millions of Arab refugees because the Arab states refused to settle them.