All places ever deemed 'good' have had sufficient technological or financial, and above all intellectual barriers of entry that filter out regular joes. BBS's in the 80's. Usenet till the early 90's. WWW till the late 90's. IRC till early 00's. Forums replaced usenet groups but have been in decline for years.

Once those barriers are broken and the masses flood in then the supply side will emerge and takes over with services designed for masses, to be used by the masses. This will drown all the interesting bits that used to be visible earlier.

The direction of development suggests that these 'good places' will be more and more scarce in the future. Further, (curiously both) privacy and surveillance laws are slowly creeping in and making it harder to freely offer services similar to those that have already died once. This further levels the playground for bigger players.