Whatever your horse in the race, be it as a TNA or WWE fan, Sting should absolutely end his career working for the latter promotion. There's a very good reason why, and Lex Luger, his best friend of many years, gave the answer to VOC Nation Radio:
"(Sting) felt comfortable in WCW and they always took care of him all those years, so really when WCW and WWE were coexisting he never really felt a compelling reason or time in his career where he thought if he went to WWE that there would be a huge positive move for him. I can't say that I disagree ... (With that said), I don't think anyone could orchestrate the ending part of his career better than WWE could. They're just so good at that. Whether it's a Hall of Fame bid or a match with The Undertaker I would LOVE, LOVE, LOVE to see that happen, personally. I think it would be the cherry on top for his career."
If nothing else, Sting deserves a grand send off complete with a well-produced career retrospective DVD, a Hall of Fame induction, and a WrestleMania moment. TNA is only able to give him one of the three but even that falls short of creating the lasting memory of one of the legendary figures in pro wrestling history.
Because that's what Sting represents. He was a really big deal for a long time. Then TNA got its hands on him and, well, he's not such a big deal anymore. But he could be again, and the WWE production team alone could make him a star on the level he once was.
Here's to hoping that's what happens.