#3 SmackDown can't afford to look like the weaker brand
Simply put, SmackDown can't afford to look like the weaker brand this year. So much damage has been done already over the past few years that it's taken time for the blue brand to recover.
Moreover, there's the aspect where SmackDown's ratings on FOX are falling a bit, which means that they'll need to have a lot going on to garner interest again. If they're made to look like the weaker brand and are buried yet again, then it could play a huge role in affecting the ratings and FOX knows this.
Among all the brands that really need to win the most at Survivor Series, it's team blue. WWE needs to establish SmackDown as the #1 brand for the first time over Monday Night RAW and if they do, it would be a huge shift in their approach with the presentation. RAW has been the "superior" brand for so long that many fans truly believe that to be the case.