Canada won’t be as eager to take US refugees as you hope. I can’t think of a small population dealing with massive refugee inflows from a place that much larger. Think of how destabilising the refugee migrations from Syria were on Europe. Lots of LGBT and sympathetic cases of course but lots of crazy and the amount of entitlement would be overwhelming.

The rest of the industrialised worried will have angry Americans in their faces screaming about their first and second amendment rights every day if there is an exodus.