I find these BMW thoughts particularly interesting in the light of Williams' recent history. I remember years ago there were debates whether Williams should have sold its team to BMW or not. In the end Sauber did it. Consequently Sauber had a more successful period in 2006-09. Of course after the pull-out of BMW it was claimed that Williams had made the right decision by not selling to BMW. But I have to say that even after initial difficulties Sauber has managed to come along well and is still doing quite well, and again consistently better than co-privateer Williams.
Also it should not be underestimated that with the help of BMW Sauber managed to upgrade its Hinwil-based facilities significantly. In 2009 there were a lot of talks about their "supercomputers". Allegedly it was supposed to enable them to adapt to the new '09 regulations well, but didn't happen so... But this modern infrastructure is certainly useful in this day.