If you want to launch a new one and be successful, you'll have to find a way to stand out from the crowd. That's probably going to be a "bias" of some kind, or at least a particular philosophy you intend to bring to bear through your commentary.
For example, I would be interested in reading a blog that reports on the news through the lens of black swans and antifragility (see Nassim Taleb's books). It's something I haven't really seen done well.