These losses could be a blessing in disguise before WC, and in a way might help with the selection
This is a great point. The Indian team have been performing badly across all formats in recent times which is why big changes are necessary to help them rise back up in an efficient and effective manner.
Its best for Indian cricket to get some new talent. Moreover relying only on Kumar bowling is also hurting Indian cricket.
Retaining Kohli is the right choice while Kumar should have been replaced across all formats a long time ago if you ask me.