Button's decision, Honda's situation etc... don't mean much to me.Mercedes has the power and image to find many sponsors and create championship wining cars in the hands of capable drivers.
The important story at here, is the commitment of Mercedes to F1.They made a brave decision in today's financial condition and bought Brawn GP but i am still afraid of the fact that F1 is becoming a dangerous playground for global automobile compaines.All started with Jaguar's entrance to sport.Big claims, splendid events and a huge disappointment.Then Toyota, enourmous budgets, workforce and the same result.BMW's failure is more interesting, bought an ordinary, mediocre team, invest heavily, make plans and set targets then leave in the first failure.Starting from Ford/Jaguars approach, F1 used as a marketing tool instead of being considered as a sport.
I hope Mercedes will stay commited for F1 in the long-term as except from Ferrari, they are the only one having a very strong racing culture in company DNA.