I don't know if I see a genuine use for a Bitcoin ATM. I would think that you could access Bitcoin anywhere on your phone or just regular mobile device other than a phone like per say a laptop or tablet. I don't see the point of an ATM unless they're going to start using physical coins which I think would ruin the point of Bitcoin. It is a technological currency exchange running on mathematical code.
This is correct if you already have bitcoins, so what you describe is about
using bitcoins.
However, you need to
acquire bitcoins in the first round, this is for bitcoin ATMs are used. Very straightforward use case.