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Torque forces especially acceleration through the wheel are minute compared to braking, bump impact, and cornering forces. Don't look for lighter wheel potential with that idea.
Wheels, being on the "front line" with regard to impacts and other ugly events are oftentimes not perfectly true, even though they started out that way. If the rim itself is to also function as a motor, I think it will need a robust design such that it doesn't lose lots of efficiency if running tolerances get huge i.e. the thing gets knocked wobbly.
I like the idea of having wheels be the "fuse" between the expensive bits and all the hazards of the road.
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