Correct me if I'm wrong, but isn't it a good metaphor to say that FPGAs are just ASIC emulators? I.e. much less efficient than an equivalent ASIC, but good for prototyping and something to use in production if you can't afford to manufacture your own chip (which is most low-volume use cases). Under this metaphor, memristor-based ASICs will obviously be more efficient than FPGAs emulating them, but that's predicated on there being a high-volume use case justifying the creation of a memristor chip in the first place.
Wow there... sometimes digital emulation of an analog circuit is faster than the analog circuit since you can solve for equilibria, easily repeat calculations, use well researched programming tools, etc
