Upload & Sell: Off
How can they control product recall issues without dates codes? If they find some production issue at some point the way to remedy it is to identify when the issue started in the manufacturing process and thereby limit the recall to the proper population of possible lenses with the issue. Remember the 24-105L for example?
Its a necessary tool for that issue. Seems strange to stop doing it.
It also keeps sellers honest. A buyer should know what they are getting and should not have to guess whether a lens is 6 mos or 6 years old.
I agree with Mike Mohrmann, I'm pretty sure they're switching to a digital date code, if you will, by placing that information on the chip in the lens. So, as of right now, only Canon can see those codes (until someone figures out how to read the info off the CPU).