Well, yes, it's not ideal and I agree that Crosby and his willingness to go was pretty unique but... let's say if Doughty, Benn, Price, Toews, Tavares or Giroux really wants to go and play. Canada has room on the roster (like they always have) and it's before the start of the tournament, I can't see them saying "sorry, we don't you here" or something like that. Especially when such a player could be the last missing piece. I think, it doesn't need to be only Crosby, as I mentioned, Canada has obviously a good number of elite players who would be perceived similarly. That's at least how I see it when I think about it.
Player who would be affected by that, can always play in some less important game(s). Schenn also played against France, I think, at least. And even if young player is scratched for most games, it's still pretty good experience for him, to stay, train and prepare with group of immensely talented players which Canada has, now for 2 years in a row.