More constructively, and immediate........

"Energy savings of up to 60%
VVVF inverter control not only delivers smooth control of the traction machine, its regenerative braking system also conserves a significant amount of energy. Used alongside the gearless traction machine with permanent magnet motor, it ensures that elevators operate at optimal power efficiency, using up to 60%** or less power than AC-2 control."

We've seen plenty of commentary off Chinese websites claiming 15/30% energy savings for NdFeB PMM employed as elevator traction drives but Mitsubishi has taken it another step to incorporate a regenerative braking system:

"Advanced energy-saving technology
The Regenerative Converter transmits the power regenerated by the traction machine via the distribution transformer to the electrical network for use in lights, air conditioners and other building facilities."

And we can expect demand from these tech advances to be immediate, not just in new construction but most building codes require elevator motors to be replaced every 19 years so we could expect these systems to be retro fitted wherever possible.

http://www.mitsubishielectric.com/elevator/modernization/elevator_index.html

Just as most first world Govt's have legislated emissions levels for vehicles, effectively energy efficiency standards, it is a reasonable assumption they will eventually get around to legislating efficiency standards for what consumes +50% of all electricity generated - the electric motor. Whether that is by building codes or more broadly remains to be seen but clearly using energy more efficiently is a big part of our future.

And that effectively sums my investment thesis Lynas > NdPr > NdFeB > inevitable drive to use energy more cost effectively.