Forced exclusion sounds terrible. It's about having options, so there is not forced inclusion, which is the trap we've found ourselves in.
Long term, the fix is to push wages up so single earners can support a family and a stay at home partner. Short term, don’t have kids if you can’t afford expensive daycare and need both incomes to break even.
How would it work? Maybe I'm wrong, but once wage goes up there'll be prices growth for housing, daycare and other related things because more families is now able to afford it. It's simply the supply-demand equilibrium. So raising a single earner wage does not seem to do anything good, maybe without decreasing at the same time wage for the second earner (which is unacceptable for obvious reasons).