Percentages (of displaced households) are irrelevant. If you are forced to move, it is 100% for you, zero for everyone else.
The East Liberty neighborhood (and commercial area) of Pittsburgh has long been a relatively-safe gathering area for Black folks and other minorities. Crime is low, there are lots of churches and businesses, and it is a nice place to "hang out."
A few years ago, Google took over a large formerly "industrial" site (a huge Nabisco bakery), remodeled and expanded it, and it now is the workplace of several thousand "Google-type" people, all of whom want to live near the complex (called, "Bakery Square"), and East Liberty is within a few blocks away.
A large apartment complex in East Liberty was purchased by a developer who immediately made plans to upgrade it, starting with the eviction of all current tenants. Lots of them were using Section 8 vouchers, many were elderly on fixed incomes...you get the picture. So you had a couple hundred "households" that were forced to find housing "elsewhere," which meant someplace not quite as hospitable as East Liberty. The evicting landlord/developer kindly assisted the ejectees with relocation, but it was what it was. A lot of uncomfortable disruption of Good Peoples' lives.
Pittsburgh's mayor-for-life, Bill Peduto, tried to extort the developer into reserving some of the apartments for "low-income" folks, but without a legislative leg to stand on, it ultimately was nothing more than a PR campaign with no success.
I personally am conflicted about this stuff, but I am compelled to come down on the side of the developer. If a neighborhood becomes "gentrified," that means that it is desirable for people to aspire to live there. And they willingly pay a premium to live there. So if you want to live there, you have to either make further sacrifices, or work to put yourself in a better position to avail yourself.
Alas, this is true for all of us. No matter what your economic stratum, you probably aspire to live "someplace nicer," and if it's really important to you, you will do what's necessary to make that move - or not. Why should it be different for The Poor? But it's a pity having to leave someplace where you have lived a long time, and are comfortable...even when your economics haven't changed, and you could afford to stay but for the gentrification.