Full-strength India is still comfortably better than Pakistan. If there is an ODI series today they will win.
Kohli is past his prime in general but he will keep spanking Pakistani bowlers. They are scared of him & they always bow down to the king.
India’s depth is also much greater than Pakistan. Players like Gill, Shaw, Kishan, Samson etc. cannot find a place in their main team yet but they would be absolute superstars in Pakistan.
India needs to change its template. They already have the players. In some ways they need to do what England did in 2015 but obviously on a smaller-scale.
Selection & tactics problems are good. They are resolvable. Teams like Pakistan have a talent issue, the players are not good enough so changing selection policy & playing style will not make a big difference because the lack of talent will remain a blocker.
India does not have that blocker. They can become a top side again overnight but they definitely need to change their mindset.