It's also about entire city cores becoming entirely reserved for wealthy people. That doesn't mean lower income people want to point at a house and say "gimme."
Doesn't have anything to do with wanting to live somewhere "swanky." Often it's about neighborhoods transforming from "livable and affordable" to "swanky," which increases landlord profits and is very nice for wealthy people, but also destroys communities.
Aside from that, there are the larger questions... like, how the whole gentrification process is tied up with income distribution... we software developers tend to be relatively wealthy, because of market forces, and this money becomes a powerful reason for landlords to keep increasing rents... etc etc...