One thing missing from the quick is operational guidance on how to make this all work smoothly. A big key to using an "all AWS" model (which as most have pointed out isn't the only or necessarily best option) is that scaling isn't instant.

You need to add some additional logic to smooth out the rate of scaling. Most deployments fall down when the rate of scaling can't keep up with the demand.

In general the white paper provides some solid AWS-specific & AWS-centric guidance on how to buy yourself some time. It's not the end-all, be-all but a good start