He totally should get Sanderson to finish it. No reason to wait until Rothfuss is dead to hire him.
(Rothfuss famously sold us the original Name of the Wind book as being the first in a trilogy that was completely written, but being too long to release as a single book was divided up. Rothfuss promised that unlike other series that take forever to come out he’d release the sequels in his series on a yearly schedule after doing some editing. 11 years later we are still waiting for the 3d book. )
