My proposal:
2. The minimum wage for tipped employees shall, upon the passage of this legislation, automatically adjust for increases in worker productivity and inflation at the same rate as does the regular federal minimum wage.
3. The scaled increase to the minimum wage for tipped employees, as noted in Section 1 shall expire on January 1, 2020 and the tipped minimum wage shall, at that point, be equalized to the regular federal minimum wage. There shall, from January 1, 2020, be no difference in the federal minimum wage for tipped and other employees.
4. From the period between January 1, 2014 to January 1, 2020, tipped employees may 'opt-out' of the compensation adjustment for tipped employees. In doing so, tipped employees shall be paid the previous federal minimum wage for tipped employees until the next scheduled increase, at which point they will be once again asked whether or not to 'opt-out' of it.
4a. Tipped employees having opted out of the compensation adjustment schedule shall be paid a gratuity of 20 percent automatically charged on all purchases by any employer employing tipped employees foregoing the compensation adjustment schedule.
4b. Effective January 1, 2020, the opt-out provision of this law and the automatic gratuity charge shall be terminated and all employees currently paid in tips instead paid the federal minimum wage.
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How does this look? Basically you would have to choose between the higher minimum wage or the last scaled minimum wage plus a 20 percent gratuity every time the scale went up. This gives everyone a pay raise while (hopefully) ending tipping as a practice by at least 2020.