Long as it doesn't directly affect the rich and powerful, likely never. Luxury condos continue to be built and people with money still moving in. Those well off are often shielded from most crime. If that changes, then expect stronger enforcement.

Until then, those with lower income / less political connections are relegated to avoid being a victim best they can or moving out to suburbs. In particular, to locales with a decent reputation for safety. Not all suburbs are equal; some have pretty bad crime too.

For many city residents I've met, they dislike the crime, but accept the tradeoff for what the city has to offer. I personally don't understand the allure of Philly, but each to their own.