What’s left to say about the CRA? Downtown Los Angeles is the graveyard of its mistakes. Over its 50-year history, the Community Redevelopment Agency became the favored scapegoat of anti-government critics from left to right. Now, sapped by its obligations for its many failed projects, the CRA’s been laying off staff and lying low. No one even wears a “CRA Go Away’’ T-shirt to its meetings anymore. There’s been no need to. Pinned by its $750 million downtown Central Business District debt cap, it actually seems to have gone away.Ten years ago the Community Redevelopment Agency, fueled by promissory notes on anticipated tax-revenue increases, was the city’s 600-pound gorilla. Now, with three quarters of a million dollars in debt to pay off, it’s more like the monkey on L.A.’s back. But hope springs eternal. The agency may be impotent downtown, but it’s busy in places the spending cap doesn’t apply. Hollywood’s TrizecHahn redevelopment proj-ect — just approved last year — was empowered by the CRA. There’s a busy strip mall at Adams and Vermont near USC that’s a CRA success story. There’s the Magnolia-Vineland center in North Hollywood, which has more than broken even.