#3 What's old is new

The original concept for the Survivor Series pay-per-view was putting together a series of matches in which teams of 4 or 5 would battle it out until one team had lost all of its members. It was something completed new and different for the (then) WWF, and it served to break up the monotony of regular wrestling matches.
They say "what's old is new" because, after a period of time, people forget about how things used to be, so when you bring something back, it feels like a new, or at least very fresh, concept. WWE does indeed run a few elimination tag matches every year (2 in 2017, 3 last year, and 2 this year, for recent history), the first editions of the show saw the majority of the matches play out under this format.
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It's a very fun format, and can be a great way to take a break from the normal and do something truly different. Even the "gimmick" or "concept" PPV events such as Hell in a Cell or Elimination Chamber aren't really all that special. They do a couple of matches that involve the concept of the show, and everything else is just normal and often forgettable. They're just regular shows with a bit of sugar sprinkled on top.
Why not run a show with mostly elimination tags? You can put one, or even both, of the World Titles on the line, but everything else can throw us back to the original concept. It would be something truly different to look forward to every year, and the possibilities are endless in regards to stakes. Some matches are just for fun and some could have bigger prizes at stake.