Well, the United Fruit debacle sent up a lot of warnings in the historical record. And while I’m sure that WalMart would like to THINK that they have the kind of pull necessary to point the CIA at some other country pulling this on WalMart properties… They simply don’t.
Beyond that, a city or county or state trying to push legislation like this on US soil would have support from basically every big-box store chain in existence (with the probable exception of Costco). However, the opposition would also be able to gather data and donations online, as well as spread petitions and bring some very talented legal minds onto their side of the table.
Personally, I don’t think that the fight would be anywhere near as one-sided if it happened today.