Be downed forever because of CME I don't know, but every month : YES.
These organisations have a lot of power indeed, but if they think they can get more money with a Pump, no reason for them to create a dump ?
Personally, I think YES. Somehow, they might be keeping it low to stock up large amounts. You know, for those who are holding a small amount of bitcoin, they always feel nervous when the bitcoin price is not growing. This means they have lost their perseverance, at some point, they will sell their bitcoins, it will be a downfall. In contrast, sharks like this, they will buy slowly, hoard a lot. It is an ongoing plot, and we cannot prevent.