Do not expect miracles from BWM buy out. It wont happen. Because:
1) Honda had already 90% finished product (racing vehicle) for 2009, BMW has nothing for 2010, tehrefore is less lucrative to potential buyer
Honda royally sucked for 2 years. Potential buyers didn't know that the Brawn would be any good, which is why there where none.
2) Honda was based in mekka of F1 (Brackley), while BMW is based in the middle of nowhere (Hinwill) far away from the major test circuit and other teams, and this is crucial because whom ever buys it will seek technical partnership from other teams
Zurich is hardly the middle of nowhere. It is the middle of Europe and very close to German, Italian and French tracks. The facilities at Hinwill are fantastic, and befitting a team ready to take on a world championship charge.
3) Honda had Ross Brawn a true F1 man who was aroud since the time of Alan Jones as such it was natural step forward for him to buy himself his own team, while BMW has that certain doctor who was always the BMW man, that makes him perfect candidate for other BMW function (eg. road car dept.) instead of buying the team. Of other candidates I have doubt in Peter Sauber's motivation but also his wealth that rules him out.
Ross Brawn is obviously very good, but don't belittle the team at Sauber. This is the team that achieved a 1/2 last year, comfortable 3rd in the WCC, and 2nd in the WCC the year before, (albeit should have been third). They have fallen back this year, but look at McLaren, Ferrari and Renault. Too many people try to place success or failure in the hands of one man. It isn't that clear cut, and the people at BMW, McLaren and Ferrari are the same guys as last year. Nobody expected such a tight field after such a huge regulations change, and a few tenths can mean the difference between podium and nothing. The guys at BMW Sauber are very professional workers at the top of their game.