We never had that concern.

[ It's an awful thing to say, but it's the truth. Alucard asked for his family's plans, and they had none for that eventuality. ]

If the complete extinction of vampires was what was necessary to stop more people from being turned or fed upon, then that would have been what was necessary. And the consequences of that- perhaps would have made more things necessary, and we would have done those as well. You wanted my family's solution, not a good solution.