Kubica certainly still has a chance if he keeps doing what's he's doing till the last race of the season. While Ferrari and McLaren beat each other up he could easily sneek through the cracks and win.
On the other hand Heidfeld will be back in about 6th or lower if he keeps doing what he's doing. I still find it hard to beleive a guy with his experience and F1 cred can't get his tyres working for so long and still uses that his excuse. I'd be embarrassed if I was Nick. Personally in all these years I've never seen him drive really fast(on the edge) and blow me away. To me he's to clinical and perfect on paper but lacks the mongeral fighting spirit required to really win. Great Test Driver!