Completely agree with you Groucho about how the increasing number of channels is diluting the content... and quality of the TV shows. Previously, with just a handful of shows to pick from, the whole family would sit together and enjoy a show. Now it's every person watching a different show. In such a case, TRPs become even more important, and serials generally keep on adding more and more surprising twists to attract more and more viewers. However, it should be according to what Viewers WANT, not what they DON'T WANT.... and this is where I fail to understand the NAIDL creative team and their decision about the leap.
It's like suicide. When it's doing well in TRPs, why sabotage it? And leaking the news about the leap from before has done nothing but damage to the show. Most of the loyal viewers are dejected, and it is the loyal viewers who from the backbone of the show, even when there's a boring storyline and other viewers switch to other channels.
Regarding your question about why Channels release their storyline from before, I agree with Poetic, that it's to tease the viewers, and entice them to watch the show, raising TRPs. As in, if you are in anticipation of some major twist, you'll start watching the show a few days in advance of the specified date, catching up on what you missed, you'll definitely tune in for the grand event and you'll probably continue to watch the next episodes to watch the aftermath..... all this while, in anticipation of the higher viewership, the channel will demand more for the commercials to be played in that timeslot, meaning more profit.
In short, it's a win-win situation for all. I remember a few times when this has played out successfully, one being quite recent, in the show Uttaran, when Vansh was about to die (I never watch the show, but in anticipation of who was dying, I started watching in those days š).... another example is quite old, when I was much younger. From the show Kyunki Saas bhi kabhi bahu thi.... the lead Tulsi was going to shoot her son. The news was leaked early, and as far as I can imagine, the response must be phenomenal.
However, the NAIDL leak about the leap is not helping it positively. Neither is it garnering any excitement, it's probably damaging the current viewership also. I won't be surprised if the TRPs of the show are down this week.