^I think it's more like a "right" to own or something like that. Like, with Maeda, she was the center all the time, and it payed off because she came 1st in the elections twice. Everyone expected Mayu to start getting #1 position from 2012 on-wards but It hasn't happened yet. Saying this, I think it's more of a If Mayu can't take #1 position then can she really become the new ace/center of AKB? The push mgmt gave her didn't really set her flying to the top. If she can get #1 this year, they will definitely go on with keeping Mayu at center position.
Outside of oshiness for me, I do think that this election will be the deciding factor though.
Mgmt have been pushing Mayuyu, Jurina and Paruru a lot since Maeda left to see who can fit in the position as the next main Center. Jurina will most likely become a "Yuko" where she is always at 2nd position because she is the center of her own group, SKE. Mayu and Paru however are two girls who management see potential Center's in, and I'm guessing that they were prepping up Paru while beginning to give Mayu the center position (mostly because she had more experience by years, and her higher rank, not just in SSK elections, but in general). Mayu hasn't been stepping up to the plate though, and missed #1 twice. I feel like if she doesn't get first place on this election, they might stop the push completely, leaving her like Yukirin, and then go onto pushing Paruru more for center.
This is all just my opinion though lol