Ehhh, maybe...I would think, just like how the coon population has been helped by habitat fragmentation and they are now MORE of a threat to nesting neotropical songbirds, (along with crows & blue jays, who now have "easy access" to nests that would have otherwise been in dense brush/woodland, and out of their "foraging plan" there is a good chance they are more of a threat NOW to the native rats then they were before the habitat was so completely disturbed and altered.

Native species can become a threat to other native species when a habitat is made more significantly livable for one then the other.