PHB? Then make it a cost argument. 

"If you plan an implement V6 today, will will cost N. If you delay until you discover V6 only services, it will cost 3-5xN to implement quickly, with additional risk of additional costs because quicker implementations are likely to miss something along the way."

On Mon, May 6, 2019 at 12:47 PM Brian J. Murrell <brian@interlinx.bc.ca> wrote:
On Mon, 2019-05-06 at 12:12 -0400, John Levine wrote:
>
> There are perfectly good reasons to use v6: no NAT in front of your
> devices,

Check.

> every service gets its own IP,

Roger.

> better connections to devices
> on mobile networks and home networks that are behind v4 NATs.

Bingo!

All very good reasons, and in fact every one of them are my primary
reasons.

But the came I am making is to PHBs, not engineers and I am trying to
find a path of least resistance.

b.