Amid a series of changes in the home selling business that have been called nothing short of seismic, the country's largest real estate industry group also agreed earlier this year to quietly end a so-called "optional" rule which had previously allowed online home listing sites, like real estate online giant Zillow, to bury home sale listings posted by services that compete with traditional real estate agents and threaten their fee structure.

But whether the National Association of Realtors can yet sidestep the threat of a massive continuing lawsuit, potentially worth billions, accusing the NAR and Zillow of using those “optional” rules to sidestep antitrust law and smash competitors, is a question now in the hands of the U.S. Supreme Court.

On Friday, the Supreme Court will consider whe

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