Gentrification is a mixed matter for me.
On one hand old neighborhoods that are in urban decay or have problems get revitalized. I saw that happen to Columbia Heights here in DC and it's almost there in the U st corridor. It opens up new housing and freshness and a new place for stores and entertainment. One the other hand it rips what culture a place once had. It displaces low income families pushing them off to neighboring places.(PG county, maybe Montgomery County.) Then there's less affordable housing creating a problem for them.It all about money and creating a homogeneous city.