That seems reasonable. Of course it would take time to spay/neuter all of the feral colonies. However, there's a loophole that would cover the time required. I believe that anyone caring for ferals should get some assitance with, or free spaying and neutering. It would be great it they got some free food also. The population will drop by attrition.
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A dog, I have always said, is prose; a cat is a poem. ~Jean Burden