Burying the stuff now is a waste of money. It's cheaper to stuff the spent fuel into dry shielded casks and wait to decide what to do with it. This forecloses no future options and allows the relatively expensive burial process to be delayed, reducing the NPV of that cost.

Waiting also reduces the difficulty of dealing with waste, since the fission products decay relatively rapidly. Aside from seven very long-lived fission products, they will be gone in 300-500 years (depending on your definition of "gone"). Indeed, the problem then becomes that the gamma emission of the spent fuel elements is so low they are no longer self-protecting against "amateur" diversion of the plutonium. (Note that this is fission products, not actinides, that decay relatively quickly.)

Personally, I suspect spent fuel will be dealt with by launching it beyond Earth. Think how cheap and reliable distant descendants of today's rockets will be several centuries hence.