that's every large city in germany too. except in vienna it only affects 1/3rd of the population because everyone else lives in affordable subsidized housing. exactly who has been forced to move away?

Vienna can't grow anymore as a result.

huh? vienna has been growing from 1.5 million to 2 million in the last 3 decades. and it hasn't even reached the peak population it had a century ago. it is also building whole new neighborhoods. i don't know how you get the idea that it can't grow anymore. nothing could be further from the truth. there is plenty of space for new development in the east for example.