House cost vs income issue

[Justin Brin]

If you look on the median house cost vs median income you notice an issue.

House median cost is going up exponentially while income is only going up linearly.

What this means? Only the rich will be able to buy an house? Only rich investors will be able to go into real estate investments? 

Data source:

Median House price: https://fred.stlouisfed.org/series/MSPUS#0

Median income: https://www.census.gov/data/tables/time-series/demo/income-p...