I think Sister Act is just breaking even right now. A show like this should have a running cost of about $650K-$700. Most weeks have been above $700K and the upcoming holidays should give them a big boost to get the show open through the winter.
As for Poppins, it either makes a ton of money or it's not making anything. It's all based on when schools are out. And I don't think Disney will close Poppins until something's ready to go into that theater(Aladdin??). If Aladdin is ready by Spring 2013, Poppins will be gone by New Year's 2012.
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.