This is another of those things that amuse me: People who think of tiny self-replicating nanomachines as a vision of the future, rather than as a reflection upon our mutual family history.
I, for one, am pretty sure that I'm a colony of several trillion self-replicating cells, whose parts are self-replicating nanomachines. And that is an amazing realization. But not especially futuristic.
I also thought recently that grey goo is a very unlikely scenario. If there were a new kind of self-replicating naonmachines, they would likely also be subject to evolution and diversify into all sorts of colorful things, just like biological cells.
I, for one, am pretty sure that I'm a colony of several trillion self-replicating cells, whose parts are self-replicating nanomachines. And that is an amazing realization. But not especially futuristic.