From an ecological viewpoint such zoning reforms have merits, but in the way we have done it so far, I question the social merits of such policies. The society must be about more than stacking people on top of eachother.
From time to time we've seen very one-sided policies pushed (often with economical focus) and several years down the line we realise the issues of such policies. We can't afford that at this point, we need to find policies that adress the full trifecta of areas to find our way forward sustainably.