I think channel was unhappy with general performance.
And SP and Zee doing well than them.
Generally during Bigboss time,they usually concentrate on it and new shows will come either after Big boss ends or after IPL over.
The competition is getting bigger and none of the new shows that started in recent times working for channel.
So they are definitely getting impatient and taking decisions hastly.
They did revamp for all shows and still it doesn't giving them desired ratings.
Infact they concentrated more on Udaan revamp and done excessive promotions and even changed it as Anjor ki Udaan and PH done lot of work for a longer track.
And the trp drops for two weeks definitely disappointed the channel.
And historical show needs a good time slot and decent trps as it is a big budget show so they prefer 8.30 because around 2 trps is almost guaranteed here at start.
They don't care what Udaan done so far for them or is it fair to end this way or anything as they are looking for more trps and better ranking in trp charts.