Far, far better would be to increase the equity in employment compensation. Starting with raising the minimum wage and penalizing the off-shoring of jobs, it's the economic "war against the middle class" and the bottom 90% of all workers that's far more destructive of social security.
Consider merely one thing. Raising the wages of 100 million workers by $1 would increase payroll tax revenues by $15 million. On the other end of the scale, how much would the ceiling need to raised on 1 million workers to equal the same $15 million?
What you propose would further institutionalize inequitable compensation ... and doesn't even begin to address the far more egregious inequity in 'investment' income: the income gotten from the labors of others.
While the following chart incorporates some inaccuracies, it's an apt depiction (Lorenz Curve) of payroll income distribution in this country. To imagine the comparable amounts to be gained from payroll taxes, merely envision the small space
under the curve to the upper right in comparison to the area covered by raising the 'belly' of the curve overall. That's the proportional opportunity.