They missed the boat back in 2008 by not making Edge vs Taker at Mania 24 a streak vs streak match. Edge was 5-0 heading into Mania 23 the year before. Then he got shuffled into the multi-man, car-wreck Money in the Bank ladder match at Mania 23 for no good reason. I think he was injured at the time, so he just did one spot then got taken out of the match. Had they just not had him lose they could have easily done the streak vs streak gimmick for the Taker match.
They did the same thing again at Mania 24 by having John Cena’s 4-0 winning streak come to an end in a triple threat match in the mid-card of the event. This despite Cena being the returning babyface looking to reclaim the world title he was never defeated for.
Point being they could very easily have then done Cena vs Taker, streak vs streak, the following year, in Texas, for Mania 25. Now THAT would have had the most dramatic near-falls imaginable, as it would have been very believable that WWE would simply transition the streak gimmick to Cena.