I disagree with that, everyone needing to sell an important amount of BTC could have interest in BTC futures.
For example if you need to buy a car or a flat in June you will be happy to be able to secure now a virtual sell of your bitcoins at 10800$ on a future exchange
Makes no sense if you ask me
You can just sell your bitcoins for dollars (or whatever) and get done with that. Or not sell anything at all and just keep your bitcoins intact until you actually need them, and hopefully with their price risen by that time. The example you provide makes sense for producers who buy raw materials in advance and want to secure current prices for future production because it affects their profits. With direct consumption like buying a car or whatever futures are pretty much useless (not even speaking of trade costs they incur)
But thankfully to futures you can just sell your BTCs in June at the current price (even a little bit higher in fact). Of course you're free to gamble on the price in June on the spot market, and just wait until then to see... but if Bitcoin worths $7000 in June finally, you will lose almost 40%...