I thought so at first but then Musk mentioned the thrusters can recharge themselves with pumps in the car. So it will actually be something owners can use repeatedly without needing complicated refills from Tesla service.

Not that I'd ever spend that much money on a car or need this at all, but for people who buy luxury vehicles I can see it. Definitely something we've never had in car history.

The Brabham was withdrawn after one race because it sprayed debris at following cars. I the thrusters used for better cornering also might push a car being overtaken just enough to get it off track. Even for track-only this won't fly. Not to mention blasting pedestrians.

What happens if there's a rock in the road and it gets sucked up?

We say McMurtry Spéirling this century :)