OTOH, they might find the folks who drive the trucks that deliver the goods to the store a lot less reasonable about things like extra time. Vandalism (rocks through windows and that sort of thing) would also be expectable... and they'll also probably find that a lot of municipalities are going to suddenly be a lot less reasonable to deal with wrt zoning issues, municipal services, and the like.
'Course, depending on whether the person from WalMart is from Quebec or not will have a huge impact on just how much will be communicated to them about why there are problems; I personally suspect that the management at the store didn't have a huge problem with having a union, and I also doubt that they really wanted to shut it down instead of trying to make it profitable; there are lots of operations like walmart that are profitable in Quebec that are unionized. However, when someone from HO comes in to cut the deal with a municipality for zoning, they're going to suddenly find the hoops they have to jump through have gotten a lot smaller and are being held a lot higher.
The way most people in Quebec are going to read this is that both the workers and the management are being punished because they want to do things the Quebec way instead of the American way.