Thank you for the response KCLarkin.
I had thought along the same lines as making a disaster plan. If the worst case scenario plays out, any assets held in any Canadian brokerage will be inaccessible. One of the first moves, would be to cut all communications/internet, and take full control of the banks. My guess Canadians will simply not be allowed to move any asset. I would also guess by the time we knew what was happening, it would be too late.
Your best best is highly portable assets: Back in the good ole days, uncut diamonds, rare art, rare coins, etc. My assumption of course, is that you and your family would be looking to exit Canada.
If you are really looking to preserve wealth, you may want to borrow ideas from organized crime...open multiple overseas accounts.