No.

Oh, so Tropers are brainless flamers now? I don't see why not, since the So Okay Its Average Troper Tales section has been doing well for quite a lot of time.

It may be a subjective trope, but that won't stop people from flooding the page (and any eventual subpages) with discussion and dissenting views on at what point a show "jumped the shark".

I used to be a user on the original JTS.com, and I saw bad things got over (in terms of both page size and arguments between users over different moments - the page for Lost was like a battlefield). Trying to integrate that sort of system into this site would require an entirely new index, and would make it the most subjective article on the site, bar none.

It's an English-language internet meme based on a US show. The phrase probably isn't that well known in Japan.

I replaced said quote (for future reference, recently cut stuff is normally in the history). But I think another quote might be more fitting, since what the quote is describing is probably Sequelitis.

Jump The Shark is something that, in the platonic ideal, should apply to single serial works, preferably Long Runners. The Trope Namer happened when Reverse Cerebus Syndrome combined with the Fonz's Marty Stu status became too clear.