[a4isms]

The easiest metaphor for HN's evolution is that of gentrification:

An outsider community forms in a down-market neighbourhood. Lacking money and power, it makes its own culture. That becomes "hip," and those with money start buying property in that neighbourhood, displacing the very people who made it hip to begin with.

As with "hackers," so also with artists, musicians, bicycle messengers, dirtbag rock climbers, frisbee players, &c. &c.