The only way this is gonna happen, is if Vince McMahon buys out TNA from the Carter family, and their affiliates. Otherwise, there really is nothing in it for the "A Company". I doubt very much if the WWE can gain any viewership by marketing a TNA talent for one night; the only people to gain from that event is TNA, and the Impact roster. You know, and the fans...but who gives a fuck about them, right?
Suspending disbelief, let's say Vince does "go crazy" and this scenario plays out. But I also would love to see a whole WWE vs. TNA pay-per-view. I've probably scripted out dozens of these things over the years; not so much recently though. So let's say two top wrestling promotions, for the love of their undying fans, put on a one-night-only battle to showcase the best of their respective brands.
WWE vs. TNA: One Night Only
Phenom Meets Icon
The Undertaker vs. Sting
I realize how "mark" ish this probably sounds, but if TNA and WWE are going to collide, they'd be mentally challenged not to include this match as the main event of the night. Sting vs. Undertaker, one time only, at an event like this...one of the biggest things to ever happen to the wrestling industry.
Clash of the Champions
CM Punk vs. Jeff Hardy
CM Punk and Jeff Hardy had one of the best World Title feuds in recent history, right before Hardy left the company. Combine all of that material, and the easy promos Punk could cut on being the "savior of WWE" and Hardy "jumping ship" because he couldn't hang with him in the ring, or backstage.
John Cena vs. Kurt Angle
I had to think pretty hard about who should face John Cena at a show like this. These two of had their matches before, but for this kind of show nothing else made sense. If Taker and Sting get one big match, Cena should have his against a star of equal talent and notoriety. Enter: Kurt Angle. John Cena "the company guy" against one who left in his prime, and never came back. John Cena "Mr. Ruthless Agression" who almost upset the Olympic champion in his debut night, all those years ago. THe face of the WWE, against the guy who helped put TNA on the map. Makes sense to me...
Team WWE vs. Team TNA (w/ Special Referee, Christian)
AJ Styles, Chris Daniels, Magnus, James Storm & Robert Roode vs. Kofi Kingston, The Miz, Rey Mysterio, Alberto del Rio & Cody Rhodes
Five TNA-made guys against five WWE-made guys; Mysterio being MAYBE the only exception. Christian makes an interesting special referee, as he's been a World Champion in both companies. He's got loyalties with both of them, and having the weight of deciding the match on his shoulders could yield an interesting result as well. If he screws over WWE, he comes back to Smackdown as a big heel. Side note: this was pretty obviously the only thing I could think of doing with all of these random people, who deserve to be in matches.
Street Fight
Bully Ray vs. Sheamus
Hey look at us, we're too big, bad guys. We're both the alpha males of our company. I have a bigger penis. Blah, blah, blah. Let these two beat the hell out of each other; I'd get a kick out of it.
Zack Ryder & Ryback vs. Robbie E & Robbie T
So The Robbie's are in the ring, in the middle of the pay-per-view. They're being all...annoying, and talking trash about TNA and WWE. Apparently there's "nobody in either company that could take them, bro!" Out comes Zack Ryder, to a big ovation. Bro. The exhausting exchange of bro-filled retorts echoes around the arena for what feels like hours. Bro. Robbie E says they'd have a match, but Zack Ryder doesn't have a big partner, like big Robbie T. Ryder says he might be able to arrange something "big" and...out comes Ryback. The beast runs through the Robbie's, destroying them in a matter of minutes. Ryback with the tag to Ryder, who hits the "Broski Boot", and the two hit their finishers simultaneously for the win. Pretty easy booking; pretty much rights itself.
Ken Anderson vs. Randy Orton
Wrestling feuds are always fantastic when there's a little bit of real-life bad blood between the competitors. I have no idea how true the rumors about Orton getting Anderson fired are, but it's still something they could build a program on.
Austin Aries & Dolph Ziggler vs. Daniel Bryan & Samoa Joe
I think it'd be fun to have an inter-brand tag team match. Heels don't give a damn about company alliance. Ziggler and Aries are both arrogant showoffs, and while Bryan and Joe both alternate between heel and face, they could both easily get over with the crowd for the sake of this match. Common bonds and whatnot.
Monster's Ball
Kane vs. Abyss
Um. Duh...?