“Which is exactly what happens when restaurants, yuppie bars and cafes move in.”

It depends on who you are talking about.
Yes, it’s possible that some of the low rent businesses could be forced out if the area by rising retail rents. But given the huge number of empty storefronts, that seems a long way off. I have not heard any protests from GA Ave businesses about being forced out by rising rents.
Given the protection that homeowners have against increses in property tax, it is unlikely that even significant increases in home values will force a homeowner to leave the neighborhood.
Renters are a different story. But that’s the risk you take when you choose to rent and are only willing to commit to a neighborhood on a month-to-month or year-to-year basisi . And even renters have some protection, such as a right of first refusal if the landlord decides to sell the property being rented, and the ridiculously difficult process of getting someone evicted.