I'll take one level over two levels. Besides, memorizing that metric fraction is just wrong. Plus, do we really want to go into space with a unit of measure whose origins are tied to the size of the Earth? Let's at least free part of the definition from an Earth-centric bias. I fear a Mars-centric meter might develop.

Unlikely. The metric units have a long history of never having been redefined in a way that breaks previous usage. As far as I'm aware, all redefinitions have just improved the precision, so they don't hurt previous users. Your proposal would make all the old feet wrong and anybody seeing "foot" would have to think about which type of foot it might me.

Oh, I don't know, I bet the future Mars independence movement will try to throw off all the shackles of Earth and switch their units of measure. I jest just a bit, but its not like we humans don't pull stunts like this all the time in the spirit of independence.

My proposal is basically the engineering estimate of foot. I would probably name it something different if I were Emperor / Very Powerful Politician. Its small enough to derive the mass and volume units directly.