The danger is a whale can buy short futures. Then he sells all his bitcoin. The price crashes as other sellers exit, he covers his shorts and buy back all his btc. This is how markets are manipulated with futures. And it's about to happen with btc. Bitcoin has been free of wall street manipulation until now.
You have been warned!
And where are they going to get the huge amounts of bitcoin to sell short and crash bitcoin. ? From the exchanges ! Remember big exhanges restrict withdrawals and they signed the New York Agreement for sw2x. ie.They have indicated their desire for centralized control.
People MUST get their coins off all exchanges!
I do not think that after the onset of futures to come capital. All the billionaires of the old school used to stocks and bonds bitcoin for them. You'll see there's even the liquidity will be sluggish on these contracts