Recent news that Big Four accounting firm KPMG is seeking an alternative business license in Arizona that would allow it to operate as a law firm has industry experts wondering whether the move might spur the other three Big Four firms and others to also try and get in on the legal business in the U.S.

The potential impact to Big Law is not yet entirely clear, but some industry experts caution that KPMG's application in Arizona may inspire copycat actions or perhaps might even lead to the American Bar Association considering revising Rule 5.4, a longstanding professional rule in the legal industry that generally prohibits nonlawyer ownership of law firms, and one that has been under attack by legal reformers over the years.