So much that can go wrong and equally right, hence they are testing this. Though a small test will be isolated from all global country impact and bias towards a false positive due to small impact. If that is projected to the entire country then and only then will the impact be truly seen.
But be interesting how this works out, I'm sure the initial trial/test will work out but once you scale that across a country then you start to see the true impact and outcome.
One question to ask yourself, when mortgages and taxes increase the costs of owning a property - have rents ever gone down! I'll say no upon that.