It changes the 2009 Race because it changes the way people approach selecting their bracket.
On a tournament by tournament basis, you are correct, it makes little difference. For the overall rankings, it doesn't matter, but for the yearly race I believe it does.
This isn't about people leaving the game, they will do it anyway. If the change is made, I certainly won't stop playing and running tournaments, but to say it makes no difference in my opinion is incorrect.
And I am saying this as someone who this change would dramatically help in RG.
And I'm saying it as someone who doesn't have a draw at all.
How does it not affect the rankings but affect the race? How does it change how you approach your bracket? Are you really suggesting people will, for example, consider Nadal for the French Open less than anyone else in future because his win is worth less points? The only thing it might change is it makes people thinking about FILLING IN THE DRAW, rather than just picking the winner and sticking whoever elsewhere.
Personally, I think about my whole bracket every week, not sure what everyone else does.
You haven't explained at all WHY it affects the race. The points given for the race are the same as far as I am aware (or perhaps still 1/5th, although I doubt that). People will still submit very similar draws - probably identical.
If you can justify why it affects anything at all, other than improving the game, please do tell us. Otherwise I'm starting a poll to change it. lol.