What's the main reason for Anupamaa trp going down?

Same as above

Isn't it obvious ? No story, no logic whatsoever, no growth in characters, wrong social messages, etc etc. 

Because Dimaag kharab ho Gaya tha makers & team ka , show should have ended or picked a decent storyline by giving importance to other characters & their real problems rather than going round & round, making ek abla sabse mahaan