By stable though do you mean a system that is designed to steal from the users of the system in a stable way but consistent way? The only stability is that if you were fortunate to be born at the right time, you get to benefit the most. But if you're off by 20 or 30 years, you're screwed. There is no way that the young people today in their 20's and 30's will ever hope to have a stable retirement or even perhaps enjoy home ownership. I am sure that once the current crop of politicians, most of whom seem to be in their 60's or so, along with their fellow boomers, die off, then it will be time to let the system implode, if they can manage to even keep it together that long. Taking into account the projections about interest expense for the government, I see no way that even the next 12 months can have any form of stability.
How does the system steal from the users?