At his wealth level (1.7 billion) I doubt he works for the paycheck. Even his non-Apple-stock and tangible wealth would be enough to live for 50 lifetimes.

If he was so inclined he could just call it quits after the cut out of spite, and hit those shareholders with a stock nosedive over the uncertainty and signalling of his departure. Of course his Apple stock would take a dive too, but it will be worth the fun!