- Overcrowding
- People being forced to move out of city centers
- Very long commute times to work
- Reduced fertility rates because people want more room for kids
All of these problems are due to insufficient housing and not just too high prices.
Your question is almost non-sensical?
Much better to recognize that "The problem is not that there isn't sufficient housing" is wrong and legalize building more housing.
I am saying "The problem is not that there isn't sufficient housing" is wrong. Very very very wrong. There are massive supply shortages of housing in many many places. Governments need to fix their oppressive zoning policies so they stop preventing people from living where they want to live (either because of $, because of waiting lists, or any other mechanism).
Those people either don't know enough about the system to take advantage of it, or don't have enough time to wait in waiting lists, so they end up paying twice what their native peers pay. But hey, they don't have a vote anyway, so it's all good...
Because there's no shortage of housing in Germany, it's just not hitting all three of those. People want to live in sought-after areas, have large apartments and pay very little. Understandable, but everyone should be able to see why that doesn't work.