((This is like a flowchart. The first line has arrows pointing to all the subsequent lines.))
It's 2016 - where's my...
Flying car → They're called "Helicopters" 
Jetpack → Turns out people are huge wimps about crashing
Moon colony → No one has put up the cash
Self-driving car → Coming surprisingly soon
Floating sky city → Turns out cities are heavy
Hoverboard → This question is now ambiguous thanks to a new scooter thing (and will lead to an argument about the meaning of "hoverboard" which is way less interesting than either kind of hoverboard)
Robot butler → He was called "Jeeves" and he wasn't that great

{{Title text: The real loser in an argument about the meaning of the word 'hoverboard' is anyone who leaves that argument on foot.}}