I saw these articles for the past week but I just figured they were rumors, but now that Madge has been confirmed to perform I'm thinking otherwise.
There isn't much of an issue here, both Lady Gaga and Madonna, two of the hugest superstars on the planet were contenders to perform at the Super Bowl. It's no surprise Madonna was chosen over Lady Gaga simply considering how long Madonna's career is and how she's seen as 'legendary status' by most of the public and media. Gaga's career is young, there's no doubt in my mind she'll be seen as an option for a halftime performer plenty of years down the line.
If anyone is stirring it up, it's Madonna. She's clearly bothered that Lady GaGa is doing what Madonna did, and better than she ever did it. Sorry if the truth hurts.
But why? Point still remains, it took Madonna two centuries (pre 2000 and post 2000). Gaga might have the same fate before she ever performs at the Superbowl
Madonna was asked 10 years ago but she declined. It's possible she could have done it before that if she had shown interest.