You can't just look at real median income. You also need to look at other factors like wealth inequality, housing prices and health care.
I agree that housing affordability is a major problem and that looking at it independently could help you quantify if housing specifically has become more unaffordable, but that's a different question then whether the median person's overall purchasing power has declined (considering all of housing, healthcare food etc)
Furthermore, there are many studies showing that more wealth inequality results in more consumption in a society. Which is not good for many reasons.