Well it's been rumored that Sting will be making his departure from TNA and arriving in WWE. Also, why would WWE release sting merchandise if he was never in the WWE. This is a big sign that sting may be on his way to the WWE, as well as to WrestleMania 24.
Sting and Flair's big rivalry in WCW was great and if I had to choose who should be in the ring last with Flair, it would be Sting, to finally finish off the long rivalry. However, I said that he "should be the last." Now, in reality I believe Flair is not going to lose at 'Mania, and he will never retire.