I just re-read Planetary Resources' P.R., and it seems you are correct in that they aren't openly proposing to shift asteroids themselves into more mine-able orbits. I misread poorly-worded reports on other sites that seemed to suggest that was part of their long-term business plan.
(I still think it's likely to happen, for economic reasons. And if you can move an asteroid closer to near-Earth orbit for the sake of mining you can always nudge it a little closer still to make a memorable impression upon someone. I seem to recall several "hard" science fiction novels where dinosaur-killers and similar objects have been posited as quite plausible weapons for conflict and extortion, not always by the "bad guys": Footfall, The Moon is a Harsh Mistress, a Zelazny story or two...)
I find myself more embittered, right at present, by the end of idealism. Remember Star Trek: "...to boldly go where no man/human/one has gone before" and the rationalization that precedes it? We don't have that future anymore. Now it's "...to boldly go where we can make more money!" Space Exploitation replaces Space Exploration, and instead of the Federation and Starfleet we get Weyland-Yutani and the Tyrell Corporation. Yuck. Maybe it wouldn't be such a bad thing if the next solar flare wipes our technological level back to the stone age.