Mini drones are generally only flown in fair weather. So once the cold, dark days of autumn, low cloud and heavy rain return, the craze will probably ease off in the UK.
Even R/C models are getting easier to fly now, with 'SAFE' technology stabilising their flight. There's also a 'Panic' button on some transmitters that will cause the model to return to straight and level flight, no matter what deflexions the operator is making to the transmitter controls:
Does look rather fun! Although hours of balsa-bashing and battling with diesel engines and 27 MHz radio was perhaps more rewarding?