If you don't think it's idiotic to say 28 hasn't lived up to his contract this season & that it's worth contemplating trading his 11th in the NHL salary for the next five years, then we're in agreement. Seemed you felt strongly otherwise.
Here's how I see it, just so we're clear.
He hasn't had a good year, overall. He was very good to start but then that slump alone was enough to change the year from "good" to "bad", no matter how it ends.
BUT, I do not think that he should be traded. It's clear it wasn't a decline, if it was a decline it wouldn't have suddenly happened in January and February, after being fine to start the year, and now suddenly be looking like normal again this month. That's not how declines work.
It was a really bad slump... that's all, and you don't panic and trade your best forward after a bad slump. That's shortsighted stupidity. Imagine if Anaheim traded Getzlaf in 2012 after putting up lower numbers... bad move. It's not a coincidence that his scoring is down as the teams scoring is down... he's had bad stretches of personal play, not arguing that at all, but the rest of the team absolutely has an effect on him too. He's a playmaker... if people don't finish then no point for G, no matter what his level of personal play is like.
So to sum it up, bad year, but nothing to worry about yet.