The incremental reforms that traditionalists favor to put the system's books in long-term balance all assume that the current trust fund balances, held in the form of Treasury bonds, are really being compounded and preserved.
The incremental forms are not favored by traditionalists. 
mnli hypothesis: The incremental forms are not favored by traditionalists.  premise: The incremental reforms that traditionalists favor to put the system's books in long-term balance all assume that the current trust fund balances, held in the form of Treasury bonds, are really being compounded and preserved.