Chicken Little was Wrong!
This is far simpler to remedy than IPv4 address exhaustion, because
- the solution need not impact end systems (hosts);
- the solution need not impact DNS; and
- the solution need not impact routers unless they speak BGP-4.
Any solution is complicated by the need for backward compatibility and phased migration.
Time until exhaustion is nonetheless sufficient to architect, design, implement and deploy solutions.
Cisco and Juniper are reportedly well into implementation.