Hawking radiation is another "semiclassical" result. IMHO Hawking radiation is much more solid than primordial black holes, theoretically speaking.

We have met the enemy, and he is us — Pogo

So to sum up:
There is no theoretical model which predicts sucking the world.
Any black hole going through the earth would as well leave some wholes, even if it would not suck the earth, so even the cosmic ray argument is completely valid. We would have observed the beasts.

Der Amerikaner ist die Orchidee unter den Menschen
Volker Pispers