I also wonder whether we'll see big cues like at regular cash machines. I think they could just go to exchanges online instead, though.
Remains to be seen whether they have enough supply of Bitcoins and/or if they will still be able to accept credit cards as these ATMs are usually also hooked up to an exhcange on the backend and will require Fiat deposits.
Well if they run out they can always buy more, which is good news for the rest of us #supplyanddemand