I don't work for McDonald's, much less in any of the departments that would make this decision. I'm speculating, but I still stand by my claim that they won't do this: they need to arrange supply lines before they can make that switch - which would take years, the tide could change at any time in those years. That is why continue to stand by my claim, but I'm not an insider and so if they do something different - it won't be the first time I predicted the future and turned out wrong.