I don't see what is so wrong with gentrification. As the economy expands and people become more prosperous, it restores blighted parts of the city to their full potential. I also think that rent control is disrespectful to the rights of the property owner. Other than making sure that there is no discrimination, and that properties aren't fire traps, government should get out of the way.
The language you choose to use -- about "blighted" parts of a city and realizing their "full potential" -- is the language of eminent domain. Which is curious given that you then turn around and talk about "rights of the property owner". Gentrification is largely about a wealthy group of people declaring that they will do more useful things with a neighborhood than the current residents would, so they should be allow…
Right-leaning people I know generally sympathize with those living in the rural blight, and their desires to stay in their hometowns and avoid displacement. Left-leaning people tend to say the rural folk need to suck it up and move to the city like everyone else, if they want better opportunities.
Then folk on either side tend to do an about-face when it comes to urban gentrification. Right-leaners tend to support gentrification and all it entails, and the left-leaners suddenly want rework local/national laws to allow the would-be displaced to remain in their homes.