Yet another potential cosmic worry?

Quantum bounce could make black holes explode : Nature News & Comment

So, Nature has a story up about the suggestion that black holes could become "white holes".  The story is more intriguing that I thought:

The theory suggests that the transition from black hole to white hole
would take place right after the initial formation of the black hole,
but because gravity dilates time, outside observers would see the black
hole lasting billions or trillions of years or more, depending on its
size. If the authors are correct, tiny black holes that formed during
the very early history of the Universe would now be ready to pop off
like firecrackers and might be detected as high-energy cosmic rays or
other radiation. In fact, they say, their work could imply that some of
the dramatic flares commonly considered to be supernova explosions could
in fact be the dying throes of tiny black holes that formed shortly
after the Big Bang.

Given that small black holes from the start of the universe might be everywhere, it would seem any planet could be in for a surprise at anytime.  At least, if this idea is right.