There are those who are voicing some concerns that futures will limit the growth of Bitcoin but in my opinion I don't it will happen that way. As long as the demand for Bitcoin is quite strong and the confidence of the market is intact, Bitcoin will fulfill its destiny as the most valued cryptocurrency whose value will continue on rising sometimes so fast and sometimes slow.
Well, it definitely will limit volatility, since it's an official and big market for shorting the coin. I think the surge in cash in the system will lead to a sprice spike, then a correction. My only concerns are the big players from financial markets trying to manipulate the price.
That, and also the tether thing that could blow at any minute.