Excuse me, but
check the data from the 2015 trustees report.
E. CONCLUSION
Under current law, the projected cost of Social Security in creases faster than projected income through 2037 primarily because of the aging of the babyboom generation and relatively low fertility since the baby-boom period. Cost will continue to grow faster than income after 2037, but to a lesser degree, due to increasing life expectancy. Based on the Trustees’ intermediate assumptions, program cost exceeds no n-interest income for 2015, as it has since 2010, and remains higher than non-interest income throughout the remainder of the 75-year projection period.
There's more, including the year by which the program is depleted. Point being, it's an unstable program. Big difference is Basic Income pays out the same year it is taxed. Benefits and Costs include everyone, so the only real limitation to its income is United States productivity. That is far more stable than young worker income VS retired worker benefits. Especially with trickle down and baby boomers altering both ends of the scale.
Here's an easier, but clearly biased read on your "paygo" program. Still, they're using real data:
Social Security: $39 Billion Deficit in 2014, Insolvent by 2035
It pays too much, benefits too few, and cannot be sustained as is. There is nothing wrong with dropping it for another program.