Google has declined to comment so far (we've asked for a statement regardless). However, as with most such experiments, it's safe to say that those black links aren't guaranteed to reach everyone. Their fate likely depends on both raw test data and public feedback. The links may get the A-OK if Google sees more people clicking results, or fade into oblivion if there's enough of a public outcry. One thing's for sure: the very fact that this is even an issue shows just how much people take Google's design for granted.

Update: As you might expect, Google tells us that it regularly runs experiments, and that it's not certain that the links will change color. You can check out the full (and slightly cheeky) statement below.

"We're always running many small-scale experiments with the design of the results page. We're not quite sure that black is the new blue."