The thing is with 'jumping the shark', its about the implausible happening, so in Happy Days, the Fonze going water skiing and jumping a shark was just so out of context with the rest of the show as to have been a ridiculous moment.
With WTD, you are of course on a path where jumping the shark...
This whole season has been an utter shambles.
Yeah, its had its moment in the past, but it's just meandered listlessly. I'm still watching as I just want to see it end, but its got to the point where it is laughably poor.