Just to be clear; the idea there was to reduce the tendency to make these threats by actually providing a serious path toward succession. I think these movements are mostly not serious or well thought out, so this would be a good way of calling their bluffs.
However they are also, in my opinion, being promoted by state actors who want to weaken Canadian and American national identity. In that way, it's important to not push people into stronger support of the secessionist position.