I think that wwe should not push any more superstars. People like Jack Swagger, Kofi Kingston, Sheamus, and John Moorison have been pushed and lost energy and failed.
People like Undertaker, Triple H, and Shawn Michaels still have it in them. Even though they are getting old they should be pushed more.
There a few superstars who has been pushed and did well John Cena, Randy Orton, and Jeff Hardy
How do you figure that they have failed? Sheamus had a fairly decent run as champion, not amazing but a much better run than CM Punk or Orton had when they first got the belt. He beat credible opponents such as Cena and Orton. He has never been beaten since coming to Raw (and I think we're supposed to forget about the Shelton Benjamin loss on ECW) in one on one competition and it took the Elimination Chamber and that features steel, chain and 5 other top guys. There is no shame in losing that match. That elimination itself has led to a revenge storyline at Wrestlemania against Triple H who will always be one of the top guys in the company.
I'd just like to point out that the last time Triple H was not in a World or WWE title match in a Wrestlemania event he participated in was Wrestlemania X-Seven where he fought the Undertaker. (The only exception being Wrestlemania 23 when he was out injured) so this is kind of a big deal for Sheamus to be the guy to take Triple H out of the Wrestlemania spotlight so to speak. Sheamus is also getting legitimate heat from the opening line of his music. His heat has gone beyond the 'Get a tan' insults and I'd say there is a good chance of him getting the Win at Wrestlemania. I'd say it's unlikely but I wouldn't put my money on it either way. I'd like it to happen to further the feud.
As for Kingston, He has an unlucky roster to work with and hopefully the Trade that is coming shortly after Wrestlemania will benefit him. Just look at the main event roster right now. How many top heels could Kingston work with to really solidify him as a main eventer? Lets cross out Orton as that story has passed and I will also cross out Sheamus as the match would be two relative rookies against each other which just wouldn't sell? Any other main event heels on Raw? No. Kingston could hopefully have a feud with Jericho, Edge or Punk sometime in the near future. I can't see Edge staying face long... but then I said the same about Triple H. Who knows.
John Morrison, and although you didn't mention him, R-Truth seem to be on the path to the Main Event by being placed in the Tag Titles match at Wrestlemania. By giving Ziggler the nod over them in the MITB qualifier, it actually allows them to avoid the mid card stigma that match grants its losers. Only the winner in that match prospers. Occasionally folk like Kingston shine through it and do get a later push but it's very rare. MITB is mid card hell, the runners up medal for Wrestlemania. Sure, you were there but no one gives a damn. Looking at this years MITB, Christian just has to win it. It'd make no sense for anyone else to do so.
The only issue I have with Morrison and Truth is that it is a wasted Wrestlemania for both of them and for CM Punk as well. It's an obvious set up for a Morrison or Truth heel turn and rivalry. Punk is continuing to be punished by the Undertaker's backstage stroke just like he was at the Rumble (eliminated 7th), at the Elimination chamber (eliminated second, by Mysterio who didn't even use the West Coast Pop or anything equally impressive) and now being given what will either be the first or second match on the card and is pretty much handed the win but that will go unnoticed because the storyline isn't actually about him.
Completely off topic, back on track: The Morrison/ Truth story will be a good upper mid card feud for both of them and they will both benefit greatly from it.
The only one I agree with is Jack Swagger. Swagger is 27 and looks it. He cannot carry off the High School Jock character they have given him. It doesn't work. His entrance is ridiculous. I don't even know what his chest pound dance thing actually is supposed to mean. The Push up thing works but it's still a bit... tacky. Again WWE have gone down the exact same thing the do with almost every amateur-turned-pro guy they get and made them have that All-American gimmick complete with a one piece and constant talk about how good that makes it. The WWE need to watch the South Park spoof episode as that explains it perfectly. Nobody who watches WWE gives a damn about 'Real Wrassling.' Kurt Angle is the only one who has made it work... because he was the first to do it. The only other successes are Brock Lesnar and Bobby Lashley... and they only escaped the stereotype by falling into another... the monster powerhouse. Swagger needs a facelift. He's a former ECW champion and I enjoyed that run. I think a move to Smackdown! would do him good.
I do actually want to hear your reasons why you called these guys failures though... I just can't see it.