Well, the last significant improvement to LDD was made probably six years ago. You can't expect software to sit stagnant that long and still be in demand. Most companies around here are still using LDD for at least the majority of their work, but most people are starting to move toward some other software, since LDD is in its last days.
What country are you seeing 12D want-ads in? I've heard of that in places like Australia and South America. Autodesk's replacement for LDD is Civil-3D, and many people around here are moving in that direction now. A few others are going to Carlson's offerings, and of course the local DOT is still in the Bentley world.