I don't know about Ganga adopting a Teepri avatar, but if what I read on here about her role in BV being transient is true then I feel that she will perhaps die in the scuttle while recovering her son and Basant and Gehna will eventually adopt her baby. Maybe the Cvs want to show a couple supporting each other while trying to conceive with the aid of medical intervention and if they don't succeed then promoting adoption.
I think the Cvs will want Jagya's redemption to be complete only after he accepts his role in deceiving Gauri as well and finally accepting her after she shows signs of redemption too.
That's my take.