First of all, Duchene will be fine. On March 23rd 2013, I'm sure if we pull out this thread, we'll be laughing at the notion. I'd consider this season a write off and see what he can do next season. If he falters again, then we have issues, but I doubt that's the case.
I definitely wouldn't scratch him at this point of the season. Why on earth would anyone want Chuck Kobasew in the lineup in favour of Duchene. Earlier this season everyone was on Kobasew's case anyways. Kobasew doesn't bring enough to the table to justify scratching your most talented player - even if he's playing poorly. Sacco needs to dress him and play him according to his effort and production (which he has been doing)
Because Duchene is terrible? Does he do anything other than get pinned deep in the defensive zone? One point (assist) in his last eight games, one goal in his last 16 games, four shots in his last four games (by comparison, Ryan O'Reilly and Paul Stastny combined for 12 last game against Phoenix).
He does nothing. It's a novelty if his pathetic line scores because of how terrible they are everywhere else on the ice. Seven minutes of ice time last game and somehow he finishes -2. And giving Duchene 10 minutes a night in meaningful games isn't going to do anything for him when he's playing like absolute crud.
This is a pretty big rip job by me, but I hate soft players, especially when they're not scoring. It was fine and dandy when Duchene had 67 points last season when the Avalanche were playing a ton of 5-4 no defense games, but he's terrible now that goals are harder to come by.
The media is such a kiss ass to him too. They cater to fans who're obsessed with him because of where he was drafted rather than what he's actually done. You can hear Mike Haynes voice crack every time he scores because he's so excited, like Duchene's is some messiah who defines Avalanche hockey. Even Peter McNabb doesn't have the nads to call Ryan O'Reilly Colorado's top center, instead referring to him as the Avalanche's "top center in terms of points and faceoffs." Sure has a damn nice ring to it, especially when he said it 10 frickin' times after Mark Giordano broke his nose.
Bottom line is Duchene sucks right now, and there's no reason to keep him in the line-up. Chuck Kobasew kills penalties and wears the other team down by forechecking, which is a hell of alot more than can be said about Matty D. Far more important to Duchene's short term development is making the playoffs this year.