It delivers for particular applications. The issue is these things can be somewhat overhyped. The general public has an impression they can be used for everything. Well in practice they cannot it adds a lot of cost.
They are used for some really specialist applications (which are generally less price-sensitive), examples include sensors, screens, reinforcement of composites.
I actually don’t think it helps that some of the scientists say things like a single sheet of graphene can support a cat, a nice soundbite. Well no it can’t in practice, the cat will fall straight through.
Nanotechnologies are being integrated into industrial processes it just takes time, they also need to get to scale to drive down the price, it is really this that drives adoption, they are still quite expensive to produce, but increasing capacity is coming on stream.