That would require a buyout of Kobayashi's seat, wouldn't it? If i'm not mistaken, he's already signed for 2012, has been signed for 2012 for several months.
Sure, buying him out of the seat isn't hard with Ferrari involved, but it would certainly shake up this already silly season. Question is, where would Kobayashi go? He hasn't got many options, unfortunately. Raikkonen is at Lotus, and it seems as though Petrov is closing in on signing again for them, Force India won't get rid of "future champion" di Resta, and Sutil's seat will most likely be taken by Hulkenberg if Sutil leaves the team. Reverend Maldonado is already signed at Brabham for 1992 Williams for 2012, and the second seat there can go to Sutil, Senna, or a GP2 Graduate, again, if Rubens retires. Caterham is sealed, Virgin is also sealed, and that only leaves one lone seat at HRT, which seems more likely to go to Dani Clos, not that Kobayashi would consider it.