How are you concluding this?
Most people in the tracker (
http://immigrationportal.com/showthread.php?p=960439#post960439) didn't give their PD but there is at least one recent approval with a 2002 PD in there (usnycus). On rupnet I'm seeing many recent approvals for cases with a 2002 PD from last week's cases (including some from yesterday and today).
I didn't think that the USCIS looked at the PD for cases except where labor substitution was used.
Note that there probably aren't that many people in the system with a PD > 2002 at this point. For most people, if they filed their labor on 01/01/03, they would have probably had to wait until at least mid-2004 to get their LC done and their GC application filed (unless the DOL is a lot faster now than they used to be).
Also, the PD rollback (if it happens) is only going to affect people who were born in India, China and the Philippines (if they filed in EB3 relatively recently). I haven't heard anyone suggest that the priority date could regress into 2002, but I suppose it's possible.
ETA