Actually TNA's women's title randomly gets main event slots sometimes. I think they treat the title somewhat respectably-- it may be the second most prestigious title in the organization right now thinking about it. That speaks more to how mishandled the others are but whatever. (and over the lifetime the X-Division at the very least beats it out)
I wouldn't call any of them "world" titles but TNA is the closest thing to one-- though not far enough ahead that the Divas title can realistically be discarded if you give the TNA title cred-- mostly think about Jakyl's idea of women willingly jumping between the two.
Shimmer would be but just doesn't have the exposure.
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I tried to have a fierce rivalry with SuperNiceDog, but he made me look worse than a GameFAQs Contest!