#5 Natalya and Ronda Rousey

Now, this would be a shock - particularly since Rousey now holds the main title - but it can't be discarded.
Natalya had a hand in training Rousey, so there's a back story there that WWE could capitalise on, and with Rousey looking out for her mentor in recent weeks, this choice is quite logical.
The only illogical part is that Rousey is the current RAW Women's Champion, and well, a special attraction of sorts - and there can be too much of a good thing. Of course, she may not hold the gold by the time Elimination Chamber comes round.
Rousey has excited the WWE Universe to no end, as well as impressing in the ring, and Natalya may be one of WWE's most underutilised talents and one of the most technically sound women on the roster, so this could be great if WWE went with it.