Earlier quoted context omitted.
So you're driving out renters, who are typically less affluent, in favor of the wealthy. Whether or not you call that success or failure depends on what you're trying to achieve, but usually these sorts of actions are trying to create housing affordability. Taking most of the supply off the market for new renters (by selling to people who can afford to buy and by incentivizing those who were already renting to stay f…
This is not how it works. Without the possibility to rent out or consolidate homeownership, the inflationary pressure on home prices collapses. You create an insane level amount of supply for homeownership on this market. An absolutely insane level. Indeed, the vast majority of increase in housing prices is because rents are so high that 7% YoY returns are possible. Without these returns, then there is no way to just…
You're completely ignoring the fact that homeownership, even if prices aren't incredibly high, requires a large down payment that many people don't have, which is why they rent. Those people still can't afford to buy and are pushed out, and they're the ones you're supposed to be helping.
"If somehow millions of people do buy houses in Berlin, then you build public housing to undercut the price of housing."
This is where your argument totally loses steam. You can't just handwave and say you'll build public housing... that is an incredibly expensive and politically difficult thing to do. When your theoretical solution to the problem is something that is very much not guaranteed (or even likely), and you pretend it'll just be no problem at all, you're ignoring reality and not presenting a useful solution.