Ok first off, I agree & disagree with some of the replies. For starters if WWE believes they can make money off of someone they will find a way regardless of age. NXT opened the door for indy wrestlers. I remember back in 2009 they acknowledged Bryans indy legacy and that is the same way they could market some of the older vets if they ever decide to push a new wave. Just imagine Beer Money being a part of NXT & presenting themselves as veterans who have done it all except WWE. Now I dont think this will happen, but its technically possible. WWE has embraced vets like Foley, Nash, Hogan, Hall, Flair, Booker, Rhino, Christian, Hardy, RVD,Truth, Sting, Dusty Rhodes, Dustin, and countless others after runs in TNA. They have even given young blood chances over the years. Vance Archer, Braden Walker (huge failure), Kaval, Woods, Kharma. Nowadays it seems like they preferred to take someone experienced and craft them than someone whos completely green. This might open some doors!
In the past WWE was more open to this notion. A huge amount of talent came over from WCW & ECW, made an instant splash and were able to continue their established careers as oppose to being booked as a rookie in a big pond. I dont think the ship has sailed for Angle. If Sting and Undertaker can still wrestle and are years older than Angle, then so can he. They will just have to make him a special attraction and he will pull out the best matches of his career. Remember when Steamboat wrestled his ass off a few years ago against Jericho I think? Well even if Angle retires from TNA, I could see WWE bringing him back to be inducted and possibly one last Mania match that same year against someone like Cesaro. And just like Steamboat, even if hes retired for years at this point, he will prepare himself and get back on the saddle like he never left.
Now I consider myself the most knowledgeable TNA fan in the world. Mainly because its been my number 1 favorite promotion since 2006. I remember Gunner when he was just an extra as a security guard during the TNA riot of 2009. I remember the first time I realized EY's entertainment talents as Super Eric (crazy I know). I remember the fallen angel feuding with Sting. Kaz getting a title shot against Angle in what was an incredible match. AJ splitting Angles head open with a ladder in 2009 lol. Point is I think many wrestlers can make an impact in WWE if given a real chance. I'm going to focus on people that havent been mentioned...
The BroMans, Eric Young, and Gunner. Gunner can play that psycho heel that Bram is playing right now, he can also play the american hero face with his military background. He definitely has the looks and any lack of mic skill could be kept from the corwd with the right gimmick. Just imagine him being introduced as a new member of the Wyatt family and eventually rebelling and feuding with Bray Wyatt to become face.
The BroMans got a lot of heat from non-watchers early on but have finally gained respect from most viewers. Their in ring timing, selling, promos, look, everything oozes professional wrestling and sometimes I think they are the pair most ready for WWE programming. They are always in character and are always working the crowd. Its incredible how good Jesse is in the ring after only 3 years in wrestling, 2 on TV. He went from green to worthy roster member within a year, honestly i think that process took longer for Magnus. Robbie has been with the company for almost 5 years and has shown great leadership when paired with people who arent as experienced (Cookie, Rob Terry, Jesse), he is very charismatic, has a fast pace technical type of style, and has successfully played a heel for almost 5 straight years. If you dont believe in the talent these men have, check out their title defenses or the potential feud between the two that seems to be on the horizon.
Now as for Eric Young, if you still aren't a believer I will argue that he has an in-ring presence similar to Flair & Savage. His timing and perfect flow remind me of Flair, while his devotion and talent at portraying his character remind me of Savage. Watch his early Team Canada Tag run with Roode, his feud with Roode in 2007, his World Elite run, his Abyss feud, and his World title run. What you will see is a vet who takes what they give him and exceeds expectations in his performance. To be completely honest I thought he reached his prime in 2009 but then Hogan and company basically disbanded world elite and he lost that momentum. Low and behold he persevered and continued to reach new heights career wise, skill wise, and even physically. I hate when people dismiss him as a Bryan knockoff. I am a huge fan of both but if you must know I will take young before Bryan. Bryan is a 15 year plus vet while Young is a 16 year plus vet. Young has a more intimidating physique and presence. Young can do everything Bryan can do and maybe better. Young has managed to avoid major injuries and has proven he can be the top face or top heel an in instant. Last but not least if you watch him in the ring, you can tell barring any injuries he will probably still be wrestling in 10-12 years. I cant wait to see his title match against Angle, should be a classic!