Other than korbanot there is a lot more that is going to change when mashiach comes – tumah and tahara issues for example. I came up with a great business idea a few years ago for when tzarat on houses could be an issue again. Basically it’s a combination of short term storage and renovations and they move your entire apartment into storage before the cohen comes to check out the place. If he declares it tamei then an expert team can do a rush job of knocking out the tzarat part of the walls and cementing/plastering new sections in. Also can find cheap local hotels. Basically instead of you having to coordinate all the pertinent issues it’s a one stop shop that does it all for you.
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