Some people suggest this is a function of too much wealth centred in too few people, causing a high demand for assets. If that is true, maybe that is where we should focus?

Massive wealth inequality is certainly a factor, not just in this but the associated affordability situation being faced by the group of people whose wealth isn't being buoyed by the stock market.

But I don't know what we can do about it when government has been captured by people with vested interests in not fixing anything.

It feels like things have to get bad enough to get people to actually rise up. Not like, revolution or anything, but real protest (and enough political awakening to understand that they are being fed culture war bullshit to distract them from the class war they should be waging).