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.
Yes and it will be too dangerous for us bitcoin holders, having bitcoin be monopolized by these rich people.
Once they took control of bitcoin they can easily manipulate it's price and may be able to kill it's economy whenever they want to. Regardless, of the demand because they know that we the user has no choice.