Gaga + Beyonce, the only females I can see performing in future Super Bowls and slaying their performances. I do agree with the point of Gaga needing to have a more fleshed out discography before she performs.
I want Britney to as well, but she'll need a flawless concept, amazing choreography not to mention her actually starting to try with her performances, put effort, gain confidence and motivation in performing and dancing great again, etc... The backlash to her miming there would also be crazy. She probably won't even do it to begin with since she refuses to perform at shows like X-Factor, Grammys, etc... even though her It's Britney iPhone app posted a link to vote for Britney to see her perform.
Bey can be an amazing choice or even Gaga 
