I say the chances of this happening in the next 50 years is less than 1/10 of 1%. Memorial and Mater Dei are supported by a fairly large number of feeder school parishes and a few non-school parishes that all pay an assessment (tax) each year to help keep tuition as low as possible for Catholic families. And even with that, tuition has increased significantly in recent years (by almost 100% over the past 8 years). There just aren't enough parishes in northern Vanderburgh County or southern Gibson County to support a third HS. I suspect if the diocese even announced they were considering building a third HS, there would be a lot of push-back. Parishes already complain about the current assessment, much less if they had to pay more to support a third school. You also have to remember that unlike the Vatican, no diocese is sitting on a pot of gold (at least not the Evansville diocese). It would take a significant amount of capital to build a new school, which could only come from private donations. The Bishop would get an ear-full from the high-level Memorial and MD donors.