Oops...that should have read "NOT" the best system.
I like your analysis. I do wonder if income and wealth can be joined unless, perhaps, there is also a kind of 'progressive tax' on wealth. Yes this does sound heretical but perhaps helpful to upward mobility to put wealth back into general circulation. Nevertheless, tax solutions may be of limited value if the leftward voter shift would be better addressed by private industry which was the vehicle used to create income/wealth disparity.
What is 'good for General Motors' is not what is good for the voter if the 'country' is now viewed as the 'world'. The corporation now belongs to the world but the voter belongs to the country. Maybe some remedial statesman will arrive with the wisdom of Solomon.