Only true if you want to scale beyond 100s of thousands of users. On Monday, March 16, 2015, Juha Saarinen wrote:

… you’re already deploying IPv6,” said the ARIN chief exec John Curran.

http://www.itnews.com.au/News/401627,ipv6-laggards-to-face-tough-questions-f...

TL;DR: CGNAT’s bad and IPv4 addresses are getting scarce and expensive, Curran says.

Would be interested to hear arguments to the contrary off list (or on list if it’s OK with TEH MORDERATOR) if there are any.

-- Juha Saarinen twitter: juhasaarinen http://twitter.com/juhasaarinen