The problem with such long-term plans is of course that none of the politicians who decided this today will be around in 2050.
The most relevant question is: What are they going to do in the next 1-2 years to make the first steps? That's far more relevant than any long-term goal.
We just survived the worst crisis of century. Perhaps it makes sense to put this plan on hold for couple of years. Or find something a bit more cost effective.
Until the next 2008. It seems like a financial crisis would put that plan into a tailspin. And there have been a bunch of those in my lifetime. I wonder if there's anything with more permanence?
Our economic systems do not support that solution, and I'd bet my life on it this will never happen. In theory a lot of things are fine, reality is ugly, very ugly.
Even the immigrant plan sucks, because there are very few countries worldwide which aren't on a trajectory to reach replacement TFR within a decade.
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