Corporate networks are not lagging for being ultra conservative; they lag, because the moment they start thinking about any change, their vendors start pushing all manners of products and licenses on them, that they insist are absolutely necessary for that change and it won't work without it. Sharks feel the blood in the water, and they want to make whatever is possible on it.

So in the end you are looking both at capex, increased opex and for what? You have ipv6? Congratulation, now you go to your C-level bosses and explain to them why it was worth it. Good luck.