I think Google is on the right track with assuming that there is no perimeter and it will only be a matter of time before every company of any decent size/budge

I think Google is on the right track with assuming that there is no perimeter and it will only be a matter of time before every company of any decent size/budget will follow suit (maybe within the next 3-7 years). The network security architecture that can best be described as a hard shell with a squishy inside has been proven time and again to be dangerously full of assumptions.