I think were debating two different things here...
1. competing, and whether or not he should continue
2. Making appearances, signing autographs,uestposin, et....which he can and should do if he chooses, and is not dependant on him steping on stage
If anything, his market value as a legend could be HIGHER if he chooses to go out the way he did, on the Olympia stage to 2 standing ovations,etc...
And it could go DOWN with a few less than stellar fiishes off he Olympia stage...