So let’s say the landlords don’t want to do this and sell up, or at least try to… who can afford to buy now? Yes the prices will come down but that doesn’t remove the need for a deposit/downpayment - yes that will be smaller but how is somebody going to save that money still? Where do they live while doing that? That is still the biggest problem… the UK does have a help to buy scheme where the government owns part of your property (acts as deposit) and you pay the mortgage on the rest, but you also pay some rent to the government for their share.
The whole system needs overhauling to make it work these changes alone won’t sort it out.
Depends on the country… in the UK for example you can serve on a last known address, and this is presumed served unless later rebutted in court… it is for the court to decide if the rebuttal is sufficiently demonstrated or not.