Your idea is brilliant, your idea is worthless (2016)
I think it depends on novelty of an idea, most ideas are slight iteration or down right copy of existing stuff. And if idea is too novel it'd not look like a good idea to begin with, unless it's very obvious, which is even more rare. This is not to say copy ideas are bad, if market isn't dominated by few then copy ideas can become a successful businesses too, but it also means execution has to come through or it will be another me too idea behind the queue.