I'm not sure I see how an increase in the value of assets hurts people's ability to invest in them.
For things like stocks, if the increased value is driven by inflation, you get less for your money. So it takes more money to store the same amount of value there.
Isn't that basically what a REIT is? It's also possible to enter into joint ownership of a property. Roommates are also kind of like acquiring a fraction of a house.
Unless you rent, in which case you are acquiring a fraction of the liability without acquiring any house.