"In other words, everything is on the table. We know what that means: Once the Constitution is opened up, the other provinces and Indigenous leaders will want to have a peek inside, too."

And that's the real problem. Every interest group will insist on a seat at the table. The current constitutional framework has, even if clumsily, accommodated most of Quebec's needs, so having it sign the constitution would mainly be a symbolic rather than substantive measure. It's not that such symbolism would be a bad thing, but it's all the associated melodrama that many Canadians want to avoid.