I suppose he has to do something to signal to voters that he's going to try to fix the housing affordability crisis, but this is pretty meaningless. But, what can he say? The truth? That the housing crisis is an extremely complex problem that will take decades to fix? Probably not going to go over very well.
Not allowing landlords to drive people into homeless on speculation and greed is a good first step to solving the very complex problem that will take decades.
Well, for one, it almost certainly won't pass. So the chances of it becoming law in the first place are pretty low. But even if it were passed, I think it would be difficult to enforce. Even if it were enforced, landlords would just hike the rent 4.99% every year.
Not to mention that unless wages also rise by 5% per year, which mine haven't recently not sure about others, then it's still unsustainable for renters.