This year was always very unlikely, but how about after AO if Nadal is forced to miss it?
Ferrer is 2060 points behind Nadal in 2012 alone. That's what he need to tie this year.
For after the AO, Nadal would drop 1290 points and Ferrer 610. So he needs 1380 points to catch up. With more time available, that sounds quite possible. But it is not a given. Ferrer will have to improve, as his current points total (post Shanghai) is behind what Nadal will have post-AO even with no additions.