He is replaceable.... by someone who will command $6 million. Several teams in the past have thought they had enough "kids" in the system that could step up, making Schneider "replaceable." And several teams have also realized that they were wrong.
Will the Wings tank when/if Schneider leaves? No. But will they thrive because he leaves and a better or equal kid comes in? That would be a more resounding no.
First, I will note your emphasis on may, which is appropriate. Second, being a franchise-long Sharks fan, and a fan of Stuart, I can say he is no Schneider. He's not even a Schneider-lite. I can see him in Detroit's lineup like I see myself in a Victoria's Secret string bikini. Sure, it would fit decently and wouldn't be an embarrassment, but it just isn't right.