In the case of an animal that is intended to be brought as a korban, but the animal has offspring before being sacrificed, the offspring retains a special status. Depending on the type of Korban, the offspring must also be sacrificed or be allowed to graze until they become unfit for sacrifice. (My related question & source.)
This is similar to when Avraham brought Yitzchack up as a Korban to Hashem. Avraham's full-intention of sacrificing Yitzchak endowed him with the status of a Korban. Having been intended as Korban, Yitzchak's offspring would also retain that holy-status.
If what I'm saying is correct, this would give a purpose to Akeidat Yitzchak other than testing Avraham. Through the Akeida, Hashem elevated Yitzchak and ultimately, Yitzchak's offspring to a Korban-status and dedicated them to Hashem. This could also be why it was Yitzchak's right to pass the birthright to either Yaakov or Eisav, (and ultimately Bnei Yisroel).
I like this idea and am wondering whether (a) any commentary or rabbi suggests it or (b) whether there is any flaw in it.