Because the WWE has never done anything like that, unless you count the time Harvey Wippleman held the Womens' Title.
You dumb, bald cunt! I'm just going to explain this once: if we all agree that it was shit when WCW did it with Oklahoma and shit when the WWE did it with "Harvina" then what in your clueless fucking brain makes you think that it is any less shit when TNA does it? Third time is still crap, you dumb fuck.
Then it was also shit when the WWE did it less than six months ago with "Santina" Marrella.
The simple fact is that the man vs. woman feud is a tried and true (well, tried anyway) gimmick that goes at least back to the days of Andy Kaufman, which got tremendous heat. It makes sense that companies well try to rekindle that every now and then.