I have mixed feelings about the CME futures listing.

I will definitely trade the futures now that I am being kicked off of BFX due to being a US person.  I don't trust Polo.

The futures will reduce volatility.  Whether this is a good thing or not depends on your perspective.  The reduced vol will make BTC more attractive to mainstream investors.

A slew of new financial products will become available that are based on BTC.  After futures have been trading for a while, options on futures will become available.  This will enable strategies that have been difficult to execute to this point.

It will provide an easier route for Wall Street and governments to manipulate price.  Why hasn't gold skyrocketed even as the us debt tops $20T (but bitcoin has)?  As they say, there's a "robust" market in gold (translation: the price behaves the way that the elites want it to).