> Had V6 launched five years earlier V4 would probably be dead.

Not a chance. IPv6 ate way more memory than IPv4 and memory was expensive back in 1995. Even IPv4 proliferation was chewing up memory and that was why the IETF introduced Classless Inter-Domain Routing (CIDR) in 1993 which gave us subnet masking.

Memory cost was a problem in routing tables until after both the DotBomb and the TeleBomb.