What if all the rich people come together and buy most of the BITCOINS can this lead to the control of power again in the hands of few.
I dont think that is going to happen because rich people have better investments where they can invest their money than bitcoin. They are going to have the power but the price would go up very slowly because they would own 90% of bitcoins.
Maybe if a few billionaires decide to invest hundreds of millions of dollars( this looks like a big amount for us but for them it is not that huge) into bitcoin that will change the situation. But that is less likely to happen because bitcoin is not the best place to invest that huge amount of money because if they control 90% of bitcoins the price will go up very slowly or it will maintain.
Besides your priorities change as you accumulate wealth, when you do not have a lot of money the priority is in building wealth so you may take riskier choices like investing in bitcoin to grow up your capital but once you are happy with the amount of money you have your strategy needs to change from building wealth to preserve your wealth that is why many of the people that are very rich have no interest in investing in bitcoin.