Let's just put it this way -- those with the loudest voices on these sorts of no-winner topics are never going to put Tim ahead of Russell, Kareem, Magic, Bird, and Jordan.
When Lebron's days are coming to a close, I suspect the discussion will be about where he ranks in a group of 6 that includes those 5 players and himself. There's virtually nothing that Tim Duncan can do that will change that. Tim will be an afterthought in that discussion; if anyone else is included in it, it will be Kobe, not Timmy. It's ridiculous, but that's the way it is and is the way it almost certainly will be.