I don't know why all SP heard was end the show. EVERYONE asked for the show to continue with Barun and change of PH.
The change of PH is not just because of the rumored politics behind the scenes, but the outward projection the PH gave. They posted on their forum that they have run out of ideas. They also posted how when they ran out of ideas for their previous show (geet) they aired episodes that did not even make sense to them. Does that not show unprofessionalism and a disinterest in the show? This is one of the bigger reasons why the PH was attacked namely Gul.
In all honesty, I don't think that the show ended due to an ultimatum by SP to retain Barun or else. And if that was the case then that means that Barun doesn't have movies to go for otherwise the issue of retaining him makes no sense. If SP had given such an ultimatum, what is stopping the PH from doing so?
IF Barun really wanted to leave for greener pastures, SP would have blacklisted him. Gia Manek didn't want to leave her show. She just wanted to participate in JDJ and SP fired her and replaced her. Why didn't they do the same with Barun back in Feb or earlier? Even now they could have done it. Gia's fans called/protested although probably not as much as we did.
I honestly believe internal politics and issues SP had with PH was the reason for the abrupt demise of IPK and not fans or Barun.
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