I think if you're a fan who isn't 'smart' to the inner workings of the business(or as much as we all think we are

) then you would likely see Flair as a washed up bum who is desperately trying to reclaim his past glories. Those who know how the business works, or those with a sense of history realize that Flair is just playing his part, whatever it may be and he has nothing left to prove because he's done it all. One of the real reasons Flair never 'walked away' is because we the fans never wanted him to. Heck, he's been written off more times than I can recall, but JCP/Turner/WCW would always give him the helm to right the ship in rough waters. However, with this retirement angle going on now, perhaps both Flair and his many fans are starting to see that it may be time to hang up the boots, at least full-time anyways.
The other side of the coin is, the majority of fans who witnessed some of Flair's greatest years are no longer fans, and most that are fans today never truly saw what Flair had achieved so they don't in a sense know what they're missing. Flair's final match will be a very emotional moment for those who have truly invested in following his career. For the rest, it will wear off by the next PPV. Fans of the current product(most who came aboard during the boon of 1996) are not emotionally invested in Flair. He's 'just another wrestler' and those of us who post here, I'd say the vast majority know that simply isn't the case. Maybe it's a generational thing, I guess.
So I guess my answer is, no. Ric Flair's legacy IMHO is not tarnished by the fact that he didn't walk away. He stayed because he felt he owes his lifestyle and successes to us, the fans( which obviously to a point we do) and just wants to keep entertaining us. We never let him leave because no matter what he does, true wrestling fans cannot stop cheering or booing or reacting to Ric Flair. I've said this before in another thread, but as long as Ric goes out on his own terms, I'm OK with that. He's entertained me for more years than I could ever hope to reasonably expect. He'll always be the 'Champ'. He's earned some relaxation....Though we know we'll be seeing 'Slick Ric' in some form or another no matter what happens in Orlando.