I have personally responded to at least four of your posts which keep wanting to overturn the US Constitutional protection of PERS.  

Eliminate that protection nationwide with a constitutional amendment and then get back to me.  

Private systems have also changed since the telephone company retirees.  Look up ERISA.  

"The Employee Retirement Income Security Act of 1974 (ERISA) (Pub.L. 93–406, 88 Stat. 829, enacted September 2, 1974, codified in part at 29 U.S.C. ch. 18) is a federal law that establishes minimum standards for pension plans in private industry and provides for extensive rules on the federal income tax effects of transactions associated with employee benefit plans."