It's definitely an interesting technology and a bold idea, but personally I have far more issues with grocery stores than just a 2m line.
For me, the far more time consuming part are:
1. Finding where something is (yes, after months you'll slowly memorize it all, but when you're new to a grocery shop, this easily takes 3-4 minute per item you need.
2. Choosing between the dozens of options.
The other day I went in this new store just to buy a shampoo and a mouthwash. For each there were over 30 near identical products and I spent way longer than necessary deciding which to go for.
With amazon fresh, I can at least search for a specific product, and also read reviews and specifics right there on the page. Amazon Go doesn't solve any of those problems...
It feels silly to me to create a whole store just to solve a tiny little problem that is grocery lines.