Having said that, if I have to entertain this idea then I'd focus on finding a replacement for Ashwin and Jadeja, the former in particular. Ashwin singlehandedly won us countless series at home with the ball and sometimes bat.
I doubt we will have a perfect replacement, especially for Ashwin because I don't really remember anyone bowling off spin these days the close to someone will be Washington Sundar but he is untested and definitely need lot of experience to have the tricky mind of Aswin like player who often do unorthodox techniques in his bowling.
We have hand-to-hand replacement for Jadeja which is Axar, but I don't think Jaddu will be leaving the long format at least for the next 3 years.