I have gotten new townies that are not vampires. The most townie vampires I have had at once has been six. The vast majority of my new townies are not vampires.
Also wanted to add that you can put garlic wreaths or hanging garlic on your lot if you don't want vampires. You can disguise or hide them if you don't want to see them.
You also have the option of using cc items with goth flair instead as of getting the pack, especially if you don't like vampires. You can also go in and manage townies in the manage households menus to get rid of extra vampires.
We do have a lot of options in controlling this so it's all about what it is worth to you and what you are willing to juggle to get your game how you want it.