[throw0101a]

How often were people upgrading computers in the 1990s and 2000s? How often are people upgrading now?

For a lot of folks when they get to good enough they stop. Understandable.

But the "good enough" of IPv4 has taken a lot of effort in the last few years. How much gnashing of teeth has NAT caused and having to invent TURN and STUN and a bunch of others things?

Anyone remember Skype supernodes?

With IPv6 you "just" have to do firewall hole punching without all the drama of packet tuple munging.

And good luck with double-(CG-)NAT hole punching.