I think it depends on how it's handled. If the CEO fosters an open environment where employees can put forward contrarian views but everyone respects that the final decision ultimately rests with her (including saying "no") then in my experience the company will be one with high morale which in turn generates success. The alternative is a CEO who views objections as disrespectful and gets rid of any "disruptive" people. I've experienced both scenarios, and the second is never anything but a disaster that leads to high turnover and the best employees leaving for roles where they are actually valued.