Comparing the wide Internet to a neighborhood with fixed space constraints is a rocky analogy to begin with. The foundation of a new city would be more appropriate, starting with a small population of intrepid explorers in a wild uncharted wilderness and growing to a massive commercial behemoth...
All of this made the web worse, not better. "Gentrification" as it relates to neighbourhoods at least means access to better amenities. When it comes to the Web, Wikipedia offers "amenities" in the way of easily accessible, extensively cited information. Most websites on the other hand gatekeep content via email signups ("get my free ebook!"), and the content itself is basically lead gen for what ever product they're pushing.