Hickel touches on this. it really depends how much of the American economy is on bullshit like advertising, cops, and cars

Net-appropriated labour comprises approximately half of the total labour that provisions goods and services for Northern consumption. [...] To maintain current consumption, Northern populations would need to substantially increase their working hours (while also committing substantially more domestic land, materials and energy to production), which would be socially and politically difficult to achieve. It is plausible that people would prefer instead to forego some kinds of production (for instance, production of goods for elite consumption) or shift to forms of provisioning that require less labour (e.g. public transit instead of private cars).

IMO it'd be fine, the whole point of a planned economy is you can finally choose efficient modes of production. there's so much stupid shit to cut out (e.g. mass incarceration, private healthcare, most finance) and you don't need a reserve army of labor anymore.