Here in NY we know that the professor's story rings true. Wealthy NYers leave for better climes, but that's not going to happen nationally. There will be some who succeed in avoiding the coming tax hike but they will be in the minority.
The 10th guy has options.
1. Works less or retires.
2. Has less to reinvest in his business so business does not grow or declines.
3. Cuts expenses, such as firing/hiring in lower tax area/country.
4. Raises prices, so that buyer pays for additional taxes.
5. Invests in different area so to receive lower taxed income.
6. Sets up a non profit to avoid taxes.
7. Other craetive method.
You are right that the taxpayer in the middle is stuck with higher taxes and less income. This is what they voted for.