It is true that no one is irreplaceable, but.
There is but.
Viewers decide, that you have forgotten. They believe that an actress, that is spoken, not Juliet or Scarlet India and you can not change.
I live in Europe, do not live in India.
Television authors, when they are doing something, they think of the viewers of their program. Viewers decide whether someone is indispensable or not, rather than individual actors.
Do you think it does not matter what the viewers think.?
Pity, it was a beautiful show, and now ...