1. Perhaps I am bitter and cynical, but with boards of directors that consist primarily of people who are CEOs for other companies, there is no pushback when executives give themselves unconscionable bonuses. Why wouldn't they consider anything that lowers the cost of doing business (such as elimination of corporate taxes) as an excuse for bigger bonuses? They have certainly never hesitated to do so when the reduction in the cost of doing business is patently borne by the company's rank and file employees. How many times have we read of executives who follow up a dramatic layoff/reduction in force (even if justified by shaky financials) with another multi-million dollar bonus for themselves? And shareholders choosing to invest in companies based on who overpays on executive bonuses and who doesn't? How many 401(k) plans choose their investments based on such considerations? Or even on how open-handedly the company pays out its profits as dividends? Perhaps if the corporate income tax were eliminated, the market would pressure some of the companies to pass more back as dividends, but I think that effect would be more limited than you do.
2. Perhaps it's my imagination, but isn't one of the problems leading to the radical differences between executive compensation and rank and file compensation that finding employment elsewhere is less of an option than it used to be? What percentage of the workforce is working where they are working because they lack options? I will believe that the threat of jobs being moved to lower-wage countries has been ended when I see it (and anyway, it used to be that companies moved jobs at will from the higher-paying northern states to the lower-paying southern states - any reason to believe that even if offshoring jobs was to be ended, it would translate into higher pay or more choices for rank and file workers?).