http://www.reuters.com/article/us-usa-oil-splitters-analysis-idUSKBN0UB08Z20151228

New splitter projects look less attractive as WTI-Brent tightens.  This tightening has more to do with the reduced light oil production in the U.S. and less to do with removing the oil export ban.  A future oil price rise will incentivize more U.S. shale production, widening the WTI-Brent spread out again, which would make splitters more attractive.