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IIUC, what Tiobe measures is current discussion. It's not a measure of popularity, exactly. More like
sqrt ((current use + interest) * (interest + fear) )

Also, Obj-C isn't one community. I'm really only interested in the Linux community, so anything that involves Carbon isn't very interesting, even if it DOES involve Obj-C. Others feel the exact opposite way. There's some overlap, but it's not huge (even though the Apple users are the larger segment they're effectively so divorced by the libraries that they use that there's little community).

P.S.: I'm not *that* interested in Obj-C, and this comment is about a year or so ago. And licensing issues mean I'm not likely to ever even LOOK at most things put up by Apple.