Earlier quoted context omitted.
But, what if everybody only buys index funds and there arent any active players anymore ? I am not an expert in this field, but I do feel that the passive nature of index funds has been benefiting greatly from the actions of active investors.
If everyone invests passive, you could make a ton of money by buying companies which are worth more than their stock or just give you an extremely high dividend.
Dividends vs stock buybacks are a wash economically - if you look at cash flows, they both reduce the market cap by the cash given to investors. It's just that dividends reduce the price of the stock directly, while buybacks reduce the number of shares outstanding.