End result Union keeps its jobs for a few years then Wallmart cleans house and all those jobs are lost forever.
Or get other stores to match prices for 6 weeks and everyone boycotts wallmart for 6 weeks over wages.
etc.
Or get supliers to boycot wallmart.
Or get legislation that any store selling more goods from China than from USA must offer X dollars per hour and X hours per week to X percent of its employees.