#4 Pressure from FOX
FOX's WWE deal involves big money. It's the biggest TV deal that WWE has signed and FOX undoubtedly has a lot of leverage, including having a say on what the roster was. They're going all-in on their investment in WWE and that includes their marketing and social media presence.
FOX Executives know how much money WWE brings in for them and will rightfully want SmackDown to look like the stronger brand. In fact, we wouldn't be surprised if FOX has a direct input in which team goes over and how things entirely play out.
Even though the "brand wars" are fictional in the WWE Universe, the reality is that NXT and RAW are both on the USA Network while SmackDown is on FOX. There's no doubt that FOX will vehemently disallow Vince McMahon to bury SmackDown the way he has in the previous years.
And that's a good thing, in our opinion, as sometimes the higher-ups in WWE need to be kept in check. In this case, they'd have every right to prevent that from happening.
Also read: 6 WWE superstars Who Vince McMahon will push for Survivor Series 2019