If you made two lists of SciFi ideas, with the fruitful ones in one list and the dead ends in the other, I think the dead ends would be in a huge majority. But that isn't a criticism of SciFi literature; a random bit of SciFi will be about as 'valuable' as any other bit of fiction.Our current state of technology is a series of realized ‘fiction.’
We're straying into the realms of semantics. But I would disagree with the idea that 'fiction' is necessarily the route to technological solutions. Very often, it's Maths and concentrated thought that yield to advances in technology. The process of invention is very varied and will depend on the individual. But so much technological advance these days is based on group discussion.
But if you want to define fiction appropriately then you can get any answer you want to this question.