The social security will run out of funds round 2040. There only two options:
Spend less by reducing benefits to retirees
Collect more from wage earners
The congress is reluctant to make changes tha tax). Keep the cap on employer contributions to avoid a business turn down. As long as business is capped also extend cap on self employed for the 50% normally paid by the employer.
The big earners (and big political contributors) will scream but who can best afford to pay. Low wagers earners would be impacted if rates were increased. Retirees would suffer in a benefit reduction.