A shidduch for Yitzchak

Avraham as he senses that his life is coming to an end tells his servant to go to his birthplace (here noted as Aram Naharaim,   Breishit 24) to get a wife for his son Yitzchak. Under no circumstances is he to take a wife for his son from among the Canaanites.   Nor should Yitzchak ,under any circumstances be taken to Aram Naharaim to marry. What if the woman refuses to come with the servant back to Canaan?.  In that case the servant would be free of any obligations connected with his swearing an oath to Avraham.  So it seems Avraham put some difficult, almost impossible restrictions on the servant.  It appears the Avraham has 2 goals to satisfy in the marriage of his son.  One is that he maintain purity if the line by not marrying a Canaanite woman(Interestingly the Torah does not hide the fact that Yehuda and Shimon married Canaanite women).  The other is that the prospective bride come to Canaan to marry Yitzchak.  If you read the verse it says the woman.  Did Avraham in a prophetic sense know that Rivkah would be the one to marry Yitzchak?  Betuel ( her father) was one of 8 siblings( one of 12 if you count the concubine Reumah).  Surely there must have been dozens of girls in the area from his "family" who would be eligible.

And if Rivkah was the "chosen " one what would have happened if she or her family had  refused to go along.  Avraham's destiny of populating the land of Canaan with his offspring would never take place.  I think this is another example along with many in Breishit of the Divine hand in history.  God chooses his elected.  In all of Breishit there is not one bechor (the eldest son) who attains primacy in the family.  The story of Yosef is another example.  If you consider that if any of the details of the story had changed, it is possible that Bnei Yisrael would not have gone down to Egypt and later become forged into a nation.  The guiding hand of God though not explicit in the text is clear to the reader.  So here too Avraham correctly sees that the "family will continue to fulfill the destiny in store for them with the long range goal of populating the land of Israel.