#2. Broken up too soon by WWE: The Straight Edge Society

CM Punk's Straight Edge Society made a huge impact in WWE but lasted less than a year. When looking back on it, their run seems a lot longer, but that perhaps has to do with how impactful it was.
Punk became WWE's most hated heel in 2009 when he constantly trashed Jeff Hardy for his real-life alcohol and drug abuse issues. After beating him in a "Loser leaves WWE" match to retain the World Heavyweight title, it planted the seeds for The Straight Edge Society.
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The basis of The Straight Edge Society was promoting the "straight edge" lifestyle that CM Punk followed - no alcohol, no drugs, and no smoking. He "rescued" Festus and with his straight edge ways, turned him into the dominant enforcer Luke Gallows.
He even recruited Serena and Joey Mercury, and the four-person faction became the most entertaining part of WWE television. As a heel, CM Punk got great comeuppance in his feud against Rey Mysterio. He eventually went bald, but Serena's release from WWE put a halt to their run.
Eventually, the faction disbanded when they lost to The Big Show and CM Punk turned on Luke Gallows. He defeated him in a singles match and Gallows would get released by WWE soon after. It was an unfortunate outcome. Punk would go on to have the run of his career a year later, but one can't help but feel that The Straight Edge Society was disbanded too soon.