i think in present time it may not be so much usable as most of the people have no idea about bitcoin . but in future it will be so much important and will have so much value when all the people will be using bitcoin then they will fee the need of ATM for withdrawal of bitcoin from their accounts.
You forget that we are moving away from physical cash. Bitcoin is fully digital, why does everybody want to return to physical access to their coins again? With bitcoin you don't need an atm anymore! You load your phone with coins and you scan the QR code in the shop.
Bitcoin ATMs are good for getting the word about bitcoin out in the world, but as far as i'm concerned, that's their only real use especially considering the insane fees.