Yeah, when they make room for Button it will be Nick that gets the boot, which is a bit unfair based on the performances to date but who knows by the end of the season....
I expect BMW will continue to supply Williams with engines even if they do buy a team (Ferrair supplies Sauber atm, Toyota supplies Jordan) so i don't see a reason to stop it. I would like to see Peugeot or Citroen come in to it now that they have scrapped their WRC programmes.
I agree with Mr Vti though, if BMW supply Sauber, or buy them, Nick is safe with a drive for them (he can replace bloody villeneuve!).