A potential candidate to replace Iwata one day would be Ken Kutaragi to prepare a fusion with Sony.
In any country known to me, shareholders have absolute power over the company. They can bring in votes for everything and the company has to obey if a majority is found. But this usually does not happen because the largest shareholders like the Yamauchi family already have direct influence on the board of directors and will not vote against their own proposals.
If you are a shareholder and can organize a majority for your ideas, you have absolute power and can even name yourself as president. It does not matter what the company culture says or how things were done in the past.







