The best way to lower tuition is to make it a community-based thing, and not just have the burden on the parents of the students.
Communities like Elizabeth, NJ do this to some extent. In Elizabeth, everything is under the JEC umbrella, headed by R’ Teitz shlita. The schools, shuls, etc. are all under one organization. Membership costs for shuls are higher than many other areas, but I believe some of that money is used for the schools.
In Bergen County, they’ve begun trying to do something like this, with NNJ Kids. Their goal is to make tuition a communal burden.