1994: RFC submitted by Apple, SGI and Sun bemon the inherent problems in the network infrastructure running out of IP addresses.
1998: Vint Cerf
warns that the internet will run out of IP addresses. Pushes for adoption of IPv6.
2010: Same Vint Cerf once again
warns that we'll run out of addresses within the year. I remain skeptical.
It's not that IPv4 won't run out of addresses eventually. It's just that IPv6 is obviously a bad solution, since vendors have resisted implementing it for over a decade.