First let me say that there are landlords out there that do a good job and do add value to society by restoring properties and providing good rentable homes.
However ... the main issue behind the problem with the property market, is, in my opinion, the problem with Sterling being a FIAT currency that can be issued at will by the private banking sector ... which means they are able to pump asset prices for as long as they want (the most important asset being houses, because that is the best collateral for them, as it's easiest to repossess). Personally I find it hard to believe anyone would argue against the property market being exploitative at whatever salary multiple the average house price is now. The issue is that FIAT currency gives the bankers a supreme advantage as they can print it at will, which means they can override what would be true market forces. The people in charge of the system all benefit in their own way from this, so it continues.
You don't have true democracy unless the currency itself is democratic, and this is not the case. Only a small sector of society is able to print currency for its own purposes, and that is the root cause of the problems. Whilst difficult to, this unfair advantage may be challenged by technology creating a more equitable currency, the chief candidate of which is Bitcoin, which is proposed to be fixed maximum supply. Of course the powers that be will fight this tooth and nail, because they do not want to give up the golden goose of being able to print themselves unlimited money. Other things that stop their money printing is strikes and revolution, but in the UK the masses don't take enough interest in finance to realise how they are being played.
Under the current system, when the system starts to fail, the goalposts are always moved. It may be that the system gets managed so badly that it will end in severe failure, at which point Bitcoin may be the only viable alternative, and this will make life fairer for all.