As a renter that is priced out of the market where I want to live/work, the greatest obstacle I've seen to long term communities are "transplants" or those who live for a few years and move. It is difficult living in a community where the overwhelming majority of your neighbors are all cycled in 5 years. We've found "transplants" are effectively anonymous :/
You can create a community in a neighbourhood like this. Five years is a pretty long time. People will come and go but if you spend even an hour per month with neighbours and other people reciprocate, it will build a community that transcends individuals coming & going. Think of a university campus: community forms there in far fewer than 5 years through regular casual interactions.
As a renter that is priced out of the market where I want to live/work, the greatest obstacle I've seen to long term communities are "transplants" or those who live for a few years and move. It is difficult living in a community where the overwhelming majority of your neighbors are all cycled in 5 years. We've found "transplants" are effectively anonymous :/