In my area community centers do something of that sort: there's e.g. one Sunday a month when people can come have breakfast together, or "let's chat in German" evening, though that's mostly aimed at people learning German and people who want to chat while also helping others learn German.
I am also very annoyed at the change from train cars with compartments to compartmentless ones. When I was a teenager I would reasonably often (~10 times a year) take a long distance train (3-8hrs). You'd then get to sit with some random people who got seats in the same compartment and the conversations you'd have were very varied and often interesting. Now that happens to me way less often, normalized to time spent on long-distance trains (local language not being my native probably contributes to that a little) and usually with older people (I'm not sure if it's a sign cultural change, or if it was always that older people were more interested in conversations with strangers).