Please move this thread to the OD Brian, thanks.
Anyway I'll bite. I can't predict the future for everyone else, I can't even predict what I will replace the SD with next year. If fuel is $5 a gallon A C240 looks pretty good.
But I'd have to see if the mileage is that much better then a W211 E320.
If fuel is $5 I will guess that resale on CDI's will be nuts, so forget that.