This is exactly how innovation is supposed to work - if a rival company (or a new entry to the market) comes up with a better solution then you have to innovate to survive. It's exactly why competition is important. It forces companies to improve what they offer. If they can do it in clever ways that don't cost much, that's even better. The business wins and the customer gets a better experience.
If Amazon has shocked the supermarket industry in to action then that's awesome.
But you are right, though - I'm working in this space and Amazon Go definitely helped to shake up some people. Let's see if we can turn this into action.
Amazon didn't really shock them into action as the service has been available for quite a few years. They are probably trying to show that Amazon shopping is not that disruptive.
I guess that was the Monoprix's point that have a system with no cashier for more than 10 year now. Or do you mean that the 10 years old system pushed Amazon to innovate by redoing it with an app ?
If Amazon has shocked the supermarket industry in to action then that's awesome.