I don't like futures for Bitcoin or Ethereum. Because they integrate the current economic system with blockchain. More precisely, they transfer the bad aspects of the current economy to the blockchain economy. Bitcoin is limited. So it is valuable.
The bitcoin is the new gold standard and hard money. Nothing prevent us building other layers on top of that for different purposes. The option of having the ultimate hard money is invaluable, and until today (until 2009) this option had been negated to each one of us. The option of having different kind of money for other uses if there is demand for it (speculation? Lending?) has a great value too.