They would shut down if ratings goes down significantly but still sometimes some good scenes and dialogues comes which are actually inspiring that's why audiences still watches and connects with it.
And star plus overall trps also aren't bad since its the first gec which comes in most of dth so this is advantage they are having and have given some of the biggest hits of tv industry that's why its having loyal audience base.
Personally I am also happy that their prime time trps are going down since they would try something different instead of love triangles.
I think yrkkh should also shut down this is another rajan shahi show which is unnecessary going on ideally they should have stopped it at the end of second generation my mother was loyal viewer of this show and she didn't even watched its third generation track but she now watches current one 4th gen track was still decent till the last leap but isn't good now i think it should also go off air.