Same here, IF the Lebreton project won't happen for Melnyk, I actually think he may be preparing his vengeance (I say this because nobody likes to be treated like ****, ex : see Craig Anderson). He is a billionaire and has a gigantic ego so he could let the situation become so bad that it would force a NHL relocation (and we know there's several intriguing markets targeted by the NHL). As long as he owns the team, he has the control over it and I don't think anyone can "force" him to sell.
If Karlsson moves (and then maybe Duchene and/or Stone), then it means the team is totally rebuilding, which means low attendance and low general financial support, which means more financial problems. We know that Ottawa is not the most viable market to begin with, it wouldn't support a losing team very long.
I'm hoping to see an EK, Stone and Duchene extensions in the next 2 weeks. If not, I would be worried. We have no choice to be patient and wait to see what will happen. If those 3 sign an extension, then it's very good news. But that damn Lebreton projects needs to happen as fast as possible, no matter who owns the team.