I'll start by saying that I agree with your assessment of the underlying issue here, I just have a slight nitpick with your comparison.
Other areas do exist that could allow people to move out of the city to a cheaper owned home in the suburbs. Personally I don't think that's a good solution though because suburbs are pretty inefficient and seem likely to exacerbate the climate problem we're running full speed into. I just wanted to point out that you can form some comparison because they are both still relatively attainable. (I might be mistaken on the real estate landscape in the UK since I'm from the US, if so just disregard this comment)
My other comment is mostly aimed at GP, but it seems that it has persisted down the comment chain, which is that from everything I've heard and read, "Higher income, lower wealth" is not an accurate assessment of what is happening when you factor in inflation. It's more of "The same/lower income, lower wealth" on average. Even still though, given the ideals of a capitalist system saying that owning capital is literally worth capital itself, lower long term wealth is most definitely a long term problem because this is a runaway feedback loop of capital concentrating in the top and the lower non capital owning members of society are slaves to capital. You might be technically earning a wage and thus not fit the technical definition of slavery, but if you have less and less freedom (defined as less freedom through lack of actual choice) because of it, I see very little difference.