If Rosberg does take the BMW seat for instance would Heidfeld be the natural replacement for him at Williams?
I doubt if Rosberg went to Mclaren then Williams would hire Kovalainen.
Heidfeld back at Williams would be cool, but I don't think Rosberg would leave this season. Williams have a decent base to use for next year's car, whilst McLaren are still learning about the new regulations. Plus, he's having a good season. He has no podiums yet, but he knows that they are within reach (and not just through luck, like last season). He's already only 1.5 points away from his total score from last season and has only finished outside of the points twice in eight races. His luck hasn't been the best, either - he should have had more points. So overall, if I were Nico, I'd be quite happy with the season so far.
