Not so in the UK. The British view of the future has been unremittingly bleak.
OUTCASTS, set on a far flung colony planet where life is near to impossible and the colonists don't know if Earth has been destroyed in some sort of cataclysm of mankind's own making. Gritty drama it might be, but bleak and depressing it most certainly was as well and it wasn't just part of the current trend for dark material reflecting the current climate.
Even the otherwise bright and cheery dinosaur nonsense that is PRIMEVAL posits a future in which mankind's few survivors are at the mercy of carnivorous predators and giant insects in the ruins of a destroyed civilisation. And the list doesn't stop there. THE LAST TRAIN had a world devastated by a natural catastrophe and the survivors reduced to a medieval standard of life and THE CHANGES had a future where mankind had developed a terror of mechanical things and had destroyed them all.