Badrinath/Rahane should be next in line but Yuvraj//Raina keep getting chances.
After Badri/Rahane it should be Rohit Sharma/Abhinav Mukund, but it'll probably be Tiwary which won't be that bad at least in home conditions.
Don't like Rahane being a backup opener either. He is more suited to the middle order probably, and Mukund should be the long term backup opener. (Not Vijay, imo).