Looking back, the last singles match for the Women's / Diva's title on "the biggest stage of them all" was... WM 23 (Melina vs Ashley). That's a superb way to shit on an entire element of your product. I can't even think of a "real world" comparison, as to how bad that is. This should be the time they build a nice little competitive feud in the two or three weeks beforehand (perhaps longer), then give them 10-15 minutes to put on a decent match.
Oh yeah, WWE.
"Needs" to get as many names as possible on the card, to keep everyone happy, and pay the last of the PPV bonuses (same with the Andre rumble). The thing is, you don't have to shoe-horn everyone into a match. They did some backstage skits a few years ago (I remember Ryder singing Friday and getting levelled by Piper, which didn't harm him - in the short term at least!), which is probably a higher quality way of showing people off - i.e. not dragging the match quality down by two shitty matches.
The other thing is, this is a performance-related business. If you haven't delivered the goods in the past twelve months, then you don't deserve to be in the ring on the biggest night of the year.
Edit: I've just re-read that - I'm sure I know what I'm trying to say...