While winning his case, which may or may not happen, will be great for self defense enthusiasts, it will not affect current law nor your legal right to carry at work, which we do not have in Michigan. It may push more far sighted companies who watch these types of things to quietly stop forbiding firearms, but I doubt it. It will mean you and I would have a nice reference piece if we had gotten fired for a similar occurance, but a civil lawsuit does not build case law nor affect laws, it only affects the plaintiff and defendant.