"But as with everything it will work for some and not for others."
Exactly. :) I don't like waiting, but I don't drink coffee either. :D The last time I was in a Starbucks was in Prague with a Starbucks coffee lover friend of mine. I had tea and loved the cheesecake.
As I said, the idea is not bad if you really need to maximize your minutes at some point of your day. The good thing is that it is another option, not just something imposed to everyone.
So, you can keep on blinking while waiting in line for an hour for your coffee, others can be sipping their favorite Starbucks in a blink. :D And everbody is happy.
I have recently found in France that MacD (I like the ice-cream coffee even I don't drink coffee and caramel ice-cream here) has self-ordering machines right at the entrance. If you wish, you can place your order and pay using the machine and with the order number you get from it go straight to picking up your order that is waiting for you as soon as you show your order number.
I used this, and loved it because I hate waiting in line, especially for food. Reason why you will never see me queuing at a restaurant or waiting for a table. I simple go elsewhere where I don't have to wait. So, there is market for such app, as we see with myself. :D Is this enough scientific proof?