pull down to refresh
They show up in search: https://stacker.news/search?q=On+Lincoln
The only real change is that the territory can't be posted in anymore, they aren't displayed in the dropdown, and any revenue from zaps/comments on existing posts is forfeit.
Pretty sure they're retained permanently as every item can still be accessed directly from https://stacker.news/items/xyz afaik
Not sure if they'd show up in search results tho