#1 WWE factions that should not: nWo
This particular former WCW and WWE faction has seen its best days in the past. When Hulk Hogan, Kevin Nash, and Scott Hall emerged as the nWo, the wrestling world was shaken at their emergence. The faction grew and grew, and overtime completely dominated World Championship Wrestling. When the nWo returned to WWE after the purchase of WCW, it also brought along with it the return of Hogan, Nash, and Hall.
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The second coming of the nWo paled in comparison to the initial group before it grew in size and splintered into offshoot groups. Further, the idea of a global take over isn't believable in today's wrestling climate. Too often, the idea of an invasion angle initially excites fans, but in execution then fall flat.
What Superstars could defect today that fans in WWE would believe was legitimate? The concept would be virtually impossible with contract information being shared publicly. Talent often decline or outright refuse that they are part of a promotion or that they are headed there to try to shake off rumors or reports that end up true.
While the nWo would be a nostalgic idea for a faction today, the way pro wrestling and the WWE operates now it simply would not be possible.