They could completely solve the projected shortage problem by investing the trust funds in something OTHER than special non-negotiable, super low interest govt bonds that they are required by law to be invested in.
That's just a giveaway sweetheart deal for the govt, fucking over all the beneficiaries in the process.
Imagine the improved returns if only 10% of the trust funds (which total over $3T by the way) were invested in an S&P500 index fund. It would be HUGE!!!!! But no, instead, everyone gets fucked over. Real nice.
If you or I hired a fiduciary investment advisor that put all our money in his own low interest company bonds, he would get his ass sued into oblivion, and probably be looking at some jail time. As usual for the govt, rules for thee and not for me.
The SSDI, SSI and Medicare trust funds should all be treated as sovereign wealth funds and managed accordingly, with the investment goal of maximizing returns while ensuring long-term ability to pay benefits as specified under law. The Alaska Permanent Fund provides an excellent model for doing this successfully.