CME has only introduced their btc futures recently, and saying that the meteoric rise over the past few months has been because of this would be wrong. Now, while we are expecting a correction after S2X, there might be people who have invested into those futures contracts quite heavily and as such, they may mitigate the price drop of the correction and thereby manipulate the prices away from pure market forces. That would be bad because it means artifically keeping the price high,and as such, might lead to much larger crash in the future when these investors decide to pull out.