While community/readership input is always valuable, I think bloggers should just write whatever they want to write. A blog is, by nature, personal and that's why we (or at least I) like them.
Now we can take the same idea and reverse it: if you have a blog, you can do what you want with it. You want your readers to choose what you'll publish next? Then do it, but I don't think it's beneficial to you, your readers or your blog in terms of creativity and uniqueness.
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