Spectators may want to archive this HN thread for posterity, because I suspect nacnud will have the last laugh. (Nacnud's comment is currently sitting at about -3 points.)
It's unlikely that future technological advancements will give malware authors more tools to work with? That seems unlikely, if history is any indication.
Imagine when you have 1TB of non-volatile storage which operates at speeds close to those we currently enjoy for DDR3 memory. Most average consumers won't use all of that space. It seems entirely plausible that a virus will write itself to some area that is never overwritten. It becomes a latent piece of malware, invisible to any filesystem, but activatable on demand by some other hard-to-detect malware. This two-step scheme would be difficult to detect since the second component does nothing except activate the first component (stored in nonvolatile storage) under some specified criteria.
Or, how about key generation or password input? Remember cperciva's post about how it was extremely difficult or even impossible to zero a memory buffer correctly? Now add in the idea that suddenly "everything is nonvolatile" and you get a perfect storm for security concerns: if a program segfaults or is terminated mid-operation, then suddenly any sensitive data it had spit out into memory might be capturable by other programs. Or, since it's nonvolatile, those secrets will persist "forever" (until they're overwritten, which may be a long, long time if storage is plentiful) and you may inadvertently leak secrets when you sell your memristor-backed storage. Whoever buys it can do some digging and uncover whatever was written into that buffer, if it's truly non-volatile storage.
So, while the future is exciting, underestimating the security implications probably isn't a good idea. We can develop new methodologies to combat the new security concerns, but new security concerns will almost certainly come to fruition. Of course, calling the concerns "new" is somewhat unfair, since new concerns are almost always very old concerns manifesting themselves in new domains, but new domains usually enable malware writers with new toolsets to exploit.