1) Shankar becomes good, either for Gayatri or because of his own blood on his hands. Rethinks the waaris thing or is not chosen as the waaris.
2) Shourya becomes bad, meaning the more he is pulled into the family business, there has to come a point where something changes him, death of someone he loves, etc.
I doubt they would show the brothers working for separate "families". But I think the characters of the father and the two sons are so complex and there's so much more than meets the eye.
Anything else you foresee as possibly happening? Also, what will happen to Simran now that we know about Shourya/Ganga? I think this will be pretty critical, I don't know why. 😕