What are some of our greatest long term investments? I can think of a few: The national parks, university system, Federal Reserve, NIH...

"you can't just abolish nepotism, that's tantamount to abolishing capitalism!"

yes

Depending on what motivations are, separate controlling interest from personal wealth, at least above some reasonable limit.

Obviously easier said than done, but unless the predominant incentive for everyone is just to generate more wealth for themselves/relatives/etc, other existing incentives should be sufficient to invest.