Okay just hear me out before you push me off the ledge... First, I'm not saying that Crosby should do it because I don't think he'll be back again(although I am in the crowd that doubts he'll play again this season). But really the concussion and injuries and missed games has little to do with my main reason for even thinking about this. And trust me... it's just a thought, I'm not even sure if I think it would be a good idea.
It's pretty obvious that when Sid is in the lineup, Malkin is a different player. Maybe it's just coincidence(which I tend to doubt), but it's been a pretty consistent history with Malkin that he plays on a different level when he's having to carry the extra weight for missing Sid.
We all know about how Malkin always enters the ice last "because he's played pro longer" or whatever his reasoning is... and it seems very obvious to me that Malkin has a pretty big ego. I'm not saying he's conceded or an egotistical person, but I get the feeling that when Sid is playing, he doesn't perform as well because it's like he's in Sid's shadow. He's just another player while Sid gets all the media attention in the world... Sid is Hockey.
On the other hand, I don't get this impression from Sid. I feel that even with his talent level(that I feel is higher than Malkin's), he doesn't have to have the spot light... he doesn't have to wear the C. I don't think that would change his game at all... I feel that if you gave Malkin the C, gave Crosby an A(when he gets back), that Malkin may(totally hypothetical) keep playing at the level he currently is(you know... the level where he's basically the best player in hockey) and maybe... just maybe you could have Malkin doing what he's doing, and Crosby doing what he's always done.
No way would the team ever take the C away from Crosby... but if Crosby were to give it up himself...
I realize a lot of bad could come from this... a lot of people would see it as Crosby giving up on the comeback and basically retiring. Anyways, it was just a thought.