I think if you carefully read the addendum to the licensing agreement
that provides for "continued use of Land Desktop..." indicates that
Autodesk has no plans to fully mimic ALL existent Land functionality
into Civil 3D, some of it will be replaced, others improved, etc.
Either way if you pay autodesk for your subscription you can still use Land,
until you cant anymore.
So far the bigest hurdle to adopting Civil 3D; from the trenches
Effective training for all users to maximize the training experience.