I wouldn't care if .amazon was unreachable by local DNS, because I bet Amazon will give every significant service an equivalent amazon.com domain. They might add "aws.amazon" but I doubt they're taking away "aws.amazon.com".
Balkanization would send an important message to ICANN.
Then how else should they enforce a law assigning the .amazon domain to its rightful owners? Not that anything would be blocked in the first place unless Jeff Bezos were stupid enough to actually use the domain for anything important.