Really?
Britain is a country noted for its class divides; and yet there are very few class enclaves in major British cities. Most people live in a mixed neighbourhood, with renters and owners all jumbled up, and with social housing mixed in. Sure, there are some pretty nasty social housing "estates" (groups of apartment blocks); but those estates are liberally sprinkled around - they occur in more prosperous neighbourhoods as well as cheaper places.
The USA used to claim it was a "classless society".
It's high quality public housing where classes mingle.
Two thirds of Vienna lives in public housing and the City of Vienna is the largest landlord in Europe. [0]
It is, probably on a related note, also the city with the highest quality of live in the world for as long as I can remember. [1]
[0] https://www.politico.eu/article/vienna-social-housing-archit...
[1] https://www.theguardian.com/business/2016/feb/23/vienna-name...
Vienna is constantly building new Social housing and new people get in all the time.
To your grandfather point: A third of people living there weren't even born in Austria, so it's not really a generational thing like you misrepresent it to be https://www.diepresse.com/69243/migration-gemeindebau-ein-dr... (in German, use Google translate)
Good things can happen if we let them.
What do you mean by "taxing liquidity", i don't even understand. Negative interest on bank deposits? It's already effectively there for about a generation.