Gary Paffett deserves a chance to at least try for a seat. As does Ms Legge. I think the new teams could be an opportunity. Pedro DLR is apparently lined up for a drive somewhere next year. I still think if BMW aren't bought out and kept on the grid it will make the driver market very difficult for a lot of guys.
Renault could use a guy like Heidfeld. Technically gifted, consistant and will bring the car home. Could win given the right car. He's a good option to replace Alonso, if not as quick he is at the very least as good from a technical stand point. Brawn could use a guy like Kubica. He'd push Jenson and when needed could win a race if Button isn't able to.
when you look at the drivers looking at seats next year:
Kubica
Heidfeld
Piquet Jr
Senna
Hulkenberg
Davidson
Sato
Any more? lol its safe to say several big names could be left upset.
Pedro DLR has pretty much been confirmed as Campos' first choice, asking to be released by McLaren. Good choice IMHO. Steady driver, unlucky not to be a winner.
As for the others, Hulkenberg looks quality, and could be in line for a seat at Williams should Rosberg end up elsewhere (at Renault perhaps), or Nakajima be placed elsewhere by Toyota (depending on Trulli/Glock). Frank's shown he's not afraid to try a rookie.
Senna could be a good bet for any of the new teams. I can't see any of the "senior" drivers left without a seat missing out with the new teams arriving, and space for another now.