It is to "hone in" on something, not to "home in".

See him here, here and here.

In short: Although Bitcoin may have some admirable features as a medium of exchange, why do you suppose that it can represent a popularly desirable store of value when there are so many other excellent alternatives?

Note that a successful currency requires both features. Absent a reason to store value in bitcoins, people will keep their stock of wealth in other assets and then exchange them into bitcoins only when they need to engage in a transaction. But in that case, the real value of a bitcoin will be approximately zero; it will be slightly positive if the market deems its virtues as a medium of exchange to exceed those of other currencies, but beyond that, it will be zero.

Okay, so it doesn't apply to anybody on /., but for plenty of people, the idea of carrying their primary computing platform in their pocket is awesome. All they need is the ability for it to play nicely with a wireless keyboard/mouse and their big-ass TV, and they've suddenly got a home computer, with all their data stored up in the cloud.