I think even now it being centralized but not by a single person or any private holders. If this could happen, then there would be a massive change and a big impact to the whole economy of bitcoin. The value of it could have boundaries. They could imploy not to take a huge amount of it. But for somehow they could simply protect it and lengthen the possibility of losing bitcoin. Then, making bitcoi  centralized could give a disadvantage and somehow advantage on it.