The U.S. Supreme Court has been knocking out blockbuster arbitration opinions annually in recent years.  2010?  Stolt-Nielsen and Rent-a-Center.  2011?  Concepcion.  2012? CompuCredit (Okay, that does not qualify as a blockbuster.) 2013? AmEx and Sutter.  At this point, SCOTUS has accepted roughly half of the cases it will hear this year, and…