This is a massive market failure that needs to be addressed

The entire real-estate market in the west (both buying and renting) is an intentional failure (but economic success for the owners) designed to be a zero sum game to squeeze newcomers and prop up existing landlords, asset owners, and banking profits on the backs of those trying to enter the market. And then western governments wonder why millennials and younger stopped having kids. Because you priced them out of home ownership, that's why.

Good luck getting the governments to break this vicious cycle and stop making real-estate an investment vehicle designed for huge returns, and good luck getting existing property owners in voting for policies which will lead to a devaluation of their homes.

I feel like if this trend keeps growing, sooner or later, eating the rich will be the only solution.

Edit: just noticed I misread Austria as Australia (lol), point still stands though, a D rating is not that bad.

E.g. FIRE. It's not unfair that those who retire early don't continue to get a salary.

It's not even unfair (on its own) that those who are irresponsible with credit cards to go on trips, instead of investing in their future (e.g. staying home and learning), later have lower income.

That's not unfair.

That would essentially be no change from now.

What, short of abolishing capitalism altogether, would be "fair"?

More money will always be able to buy more than less money. And the comment you're replying to would HEAVILY subsidize people for their needs, while discouraging everyone's wants.