It turns out the Bella Twins only came back to take part in the women's revolution for the briefest of spells. Even though Brie got involved in an angle with her husband against the Miz and Maryse, as well as beginning that short-lived feud with Ronda Rousey alonside Nikki, I can see the Bella fire isn't burning as brightly as it used to. In 2013, they'd have made attempts to get the Tag Team belts the moment they materialized. Right now though, with baby no. 2 for Brie and a tricky neck injury for Nikki, the two of them have been left out of the loop.
Perhaps after Danielson no. 2 arrives and Nikki sorts out her neck issue, we might see them again, but I'm guessing their goals might be different. Either way, they'll be older, so the test of time will be presented to them and whether they pass or not depends largely on the age of the roster when they rear their heads again.