I think it'd be nice to do two part time parents or alternating being a house spouse. Some poly friends have also been talking about triads with a house spouse and two workers.
So many things can't even be imagined under the boot we are being crushed by.
Communal child rearing is cool too but the inter-generational family system has been destroyed for so many folks already or is in situations where the relations aren't safe. Hopefully more folks can build healthier multi-gen systems but it's not a 1 generation project.