What makes VVS even more vulnerable is that he's batting at 5, an easier slot to put a youngster into. We've seen how it hasn't helped Australia having to rotate youngsters/out of form batsmen through no. 3. Pushing Kohli up there is a tough ask, obviously can't be done on form. Maybe Pujara can go there straight away.
But if you're looking to get Rohit in there, then putting him at 5/6 is a lot easier and how a youngster should be introduced whenever possible. That's why the pressure will be applied to VVS even further.