The only real problem I could see with a "farewell tour" for Sting is that you never know when the guy will quit the business for good. It's possible that he'll "change his mind" later, like Flair did - and wrestle again...after he "retired" from the business. What if TNA gives him a big send-off, and he goes and wrestles for WWE? I know that everyone (including me) wouldn't mind seeing him in a WWE ring before he's done for good, but it might taint his legacy if he has an "official retirement" (like the WWE gave Flair) and then he ends up wrestling in another company. Not that it really hurt Flair's legacy overall, but people were still pissed about it. Maybe it had more to do with Flair leaving the WWE and going to TNA though. The fans would probably be more forgiving of Sting, if he did the same thing Flair did (only backwards, by leaving TNA for the WWE after a "retirement send-off"). After all, fans have been clamoring for Sting to wrestle in the WWE ever since WCW shut it's doors for good.
If Sting is finally ready to retire, then of course a big send-off for him would be great. Even though I'd love to see Sting end up in the WWE (especially for a match against 'Taker), deep down I'd rather see him wrestle his final match in a TNA ring. There's a certain mystique about Sting, and most of that (at least in my eyes) comes from being the most famous wrestler in the world that has never worked for the WWE. When I say "final match", I mean exactly that. The very last match Sting ever wrestles. I don't mean a "fake" retirement (for lack of a better term), like Flair had in the WWE.
I was actually thinking about this a few weeks back, about whether or not Sting would ever have another run with the TNA WHC. Maybe his day for being Champ has come and gone, but maybe not. Maybe TNA would honor the Stinger by giving him the title one last time. Then again, I think even Sting knows that it's time to let the young bucks shine...Sting is so big, he doesn't need another title run to "solidify" anything (let alone the legacy he'd leave behind). On the flip side, TNA no longer needs Sting to be their Champ anymore either (for name recognition, or whatever).
If Sting does have some kind of farewell tour, I'd like to see him have his send-off in TNA...not an independent tour (like Hogan's was?), or with the WWE. But then again, he could say he's never going to wrestle again this week on Impact - and I'd be "okay" with it. Sting has given us so much in his career, that almost anything he does wouldn't take away from his illustrious career (when he finally does retire for good).
