They have learned the "rocket ship to the moon" doesn't work... it hasn't since Hogan 30 years ago in reality. Anyone of any substance in the last 30 years has had longer, more sustained build up...through the gears and outside of the dreaded "treadmill".
Most regular readers of my posts will know this one, but even now it's still there... It started with Bret and Shawn, basically there is a fixed trajectory that is Tag Team or debut to Mid Card title and if you haven't won the world within 2 years of losing that midcard title you are a failiure. Almost every main event guy in the last 20 years has gone through that treadmill... Kurt Angle, Rock, Booker, Benoit, Jericho, Punk, Christian, Edge, Miz, Jeff Hardy, Cena, Batista, Orton even Bryan.
The exceptions are the guys like Austin who was given a sustained build over 20 months. Guys like Mark Henry where it took 15 years for him to break through, Foley and Triple H who got where he did through connections.
Then you have the rocket ship guys who invariably failed other than perhaps Taker and to a lesser extent Sheamus who is still a viable main eventer even now. Guys like ADR, Lashley, Brock, Khali, Hassan, even Warrior all failed.
So they've gone back to the drawing board with the Shield and particularly Bray Wyatt... They made sure Wyatt was the finished article before bringing him up, spent money on the song, the presentation like the vignettes (although they are starting to miss the individual promos each time they come out...the "we're here" thing could hurt them) and rather than just feeding talent after talent to them, they have been VERY selective with who Wyatt gets in the ring with, yet he has beaten them all... not easily, but enough to make him dangerous to anyone. For him to be facing Cena less than a year after his debut at Mania is a joke to some, but it's how the great heels of the past were built... no rising through the midcard, holding the IC and then facing the champ or the big names... guys like Bundy. Piper and the like didn't toil in the midcard...they had one or two select feuds and went straight to Hogan.
With Shield it's slightly different in that there are 2 can't miss talents in there and one who WWE would "really like" to get over as well... Stables are always about the guy who MUST get over from it, the 2nd guy who you want over from it and anyone else is a "would like". With Evolution, Orton was the MUST get over and Batista the like to... for the Shield most thought Ambrose was the must and on balance it probably still is... they wanted Reigns over and that has happened so focus may have shifted slightly but Ambrose is well on his way to 4th longest running US champ in history while Reigns has his 2 "landmarks"... they're pretty even. Rollins is "on paper" lagging behind but he was also Tag champ for most of the last year and will likely get a very big moment when he gets to "choose a side" on RAW. Logic says he goes heel but I actually see Ambrose joining the Wyatts so Rollins is perhaps gonna stick with Regins to begin with.
The interesting thing is they have announced the Ladder match for NXT and I think that's where we see the next "push to the moon" begin with Adrian Neville... I think he is gonna win the title from Dallas and that will make his name so to speak - Rey is pretty much gone so they need a new high flyer and Neville coming to the main roster in 3 months or so makes a lot of sense. Does he merit it over others, I think so cos he will offer something relatively unique... Sami Zayn is gonna me more of a longer sell, especially as he looks like Sheamus' little brother.
But forget this myth that they can't create talent cos nobody can... they can mould it, and give opportunity. But the biggest reason guys like Ziggler, Swagger and the like failed is their own flaws, be it arrogance, stupidity or in the case of someone like Barrett just sheer bad luck. All are almost redeemable except maybe Dolph who is too far into the concussion mire now, one more they have to retire him. Swagger is showing signs of being interesting again, as is Barrett - only thing holding him back is the dodgy arm he got courtesy of Dolph. He got a push to the moon too and warranted it... if Dolph hadn't tried to twist mid air, Barrett would probably be headlining 30 by now.