not sure why Pippin is being compared to Sister Act, but Pippin is selling out now and is grossing over $1 million weekly. Something Sister Act never did despite being in a much larger house. Pippin's weekly nut is also lower than Sister Act's. I see Pippin lasting for 3 years or so, just as long as they bring in proper replacements(stars or not).
A Chorus Line revival played its final Broadway performance on August 17, 2008. The tour played its final performance on August 21, 2011. A new non-equity tour started in October 2012 played its final performance on March 23, 2013. Another non-equity tour launched on January 20, 2018. The tour ended its US run in Kansas City and then toured throughout Japan August & September 2018.