I mostly agree with you on the article. I don't think gentrification is really viewed as an issue of "this is a terrible thing and you should feel awful" so much as a "this is a very grey area issue that has no easy solution and certainly isn't malicious." Of course areas should strive to improve and have more money flowing through them, but it does push out people who have very little means to move somewhere else or somewhere to go, and there increasingly few places overall for them to go. You most certainly should not feel guilty about being well established or for going somewhere that you desire to be and is within your ability to live. It's similar to when sexism is discussed and they say 'men are the problem', it refers to the institution, not the individuals.