Guys,
I believe MMC have rarely done a good job of branding or marketing the company AND yet the cars have still sold (and for the most part sold well). Therefore, while I do not like the new logo - it is a bastardised post-modern stylised of a logo that is already strong, steeped in tradition and doesn't require an overhaul - I do not believe it will adversly effect sales.
As Trent has said, it would be unwise to move too far away from tradition as it had served the company well up to this point (almost 100-years!). I'm all for organic improvement but this logo seems change for the sake of it.