#8 The Usos
It seems that any time a Superstar's contract is set to expire, WWE will fear that they might think of leaving.
Having a new company around with extremely deep pockets would be enticing to any wrestler.
And since AEW has said that they will feature tag team wrestling, perhaps a team like the Usos would consider leaving WWE.
If they did leave WWE, it would strike a blow to an already depleted roster of tag teams. SmackDown has been dominated by the Usos, the Bar and the New Day, so to take one of those teams off the roster would certainly hurt WWE's chances of improving the division.
One reason that might entice the Usos to leave is that despite being one of the top teams in WWE, they have only been on the main show of WrestleMania once (last year).
Having a slightly smaller roster in AEW will likely allow more wrestlers to be showcased. Even though there are two sets of tag titles in WWE, if you aren't the champs or challenging for the titles at 'Mania, you might get left off the show or dumped in the battle royal.
All that matters is that if the Usos want something new, they might not re-sign with WWE. They have the potential to be a top team in AEW and to battle with several talented wrestlers, they haven't faced before.
But will their link to the Rock and Roman Reigns keep them loyal to WWE? The jury's out but the Usos did come up through the WWE system.