32bit IDs

A lot of protocols use 32bit IDs
32bit IDs = management headaches, scalability limitation

What is the domain of uniqueness?
BGP, OSPF - within an AS
NTP - worldwide uniqueness needed

How wide does ID need to be?
128bit - global IPv6 address can be used
64bit - EUI64 maybe? (not guaranteed to be unique)
64bit - 32bit AS number + 32bit serial (management headache)
32bit - insufficient (32bit AS numbers)

Scoped IPv6 address and IDs?