They did something very similar to this about 2 years ago when people made games based around ZP. I don't really see how this is Jumping the Shark. Every so often they have Yahtzee step out off his basement, blinking in bewilderment, and tell him to do this or that silly thing. It's the kind of thing that gets asked of people who are big deals. And make no mistake Yahtzee is still a big deal.Copper Zen said:Now they're having write ins: [http://www.escapistmagazine.com/news/view/121401-Help-Choose-Which-Indie-Speed-Run-Games-We-Send-to-Yahtzee?utm_source=latest&utm_medium=index_carousel&utm_campaign=all]. That's never a good sign. Hopefully it's just a New Year thing but I've seen this sort of "audience participation" [http://www.escapistmagazine.com/forums/jump/18.398180.16281343] invitation pop up usually when a show has Jumped the Shark. [http://tvtropes.org/pmwiki/pmwiki.php/Main/JumpingTheShark]
As for the quality of his work, I really haven't seen any real diminished aspect of it. It's still fun, it's still hilarious, and it's still insightful at points. He paints a better picture of games with a couple of jokes and strained metaphor better then most people ever do.
Also even if ZP has declined in quality over the years I think the real draw of Yahtzee right now would be his column Extra Punctuation. It might not be as funny but it definitely is a lot more thought provoking. So even if ZP does crash and burn at some point I'll still stick around to read his writing.