It is cunning idea, though in larger projects, using segmenting curves to represent lines will slow down Inkscape.
[I used Inkscape to design a guitar. It's a fine program, but for a fairly large project I noticed some slowdowns on a reasonable machine.]
Converting the curves to lines will mean more file management: one as a source, another to be CAM'ed.
Pushing the idea further. allowing the plugin to G-code curves might be a good thing for people who do a lot of 2D sheet metal work.