Keep in mind the context in which this is being said. nobody is saying that if Subban isn't signed for longterm tomorrow that MB should be fired.
The 'what if' scenario being discussed is if we lost Subban (or wound up having to deal him) then MB should be fired. And there's absolutely nothing dumb about that.
It is the GM's responsibility to build winning teams. You can't build winning teams by ****ing around with your best players. He screwed up the first time and that can be forgiven. But to lose Subban now or going forward? Hell no. That is most definitely a fireable offense and to be honest with you, I wouldn't want my team run by a GM who can't get that done.
The whole false choice that I've read on here from some posters (team vs player) is absolutely laughable. The team is made up of these players. Not all are created equal and not all are going to be paid equally. You pay your key guys. You work to keep those key players. And you do this because those are the players you're going to build your team around.
In this thread I'm reading that Chicago won't win cups anymore because they've paid their two big stars a ton of cash... that's what those same posters said the last time around. Chicago's been smart with those guys. Keep them happy, pay them well and then work to fill in the rest of the lineup. You don't **** around with your best players.
As for MB... as I said, I think this will be moot and PK will be signed. If he doesn't get signed though and we lose him? It would be dumb not to fire the GM.