I do not believe it is predatory at all, actually (after hearing that it will NOT be retroactively applied) 
I do, however, believe that if I was a new affiliate – I wouldn’t touch ANY ‘negative carryover’ program.
Yes, we would have been much happier being notified of the changes.
Here is a list of ALL changes made to the terms:
http://www.affiliateguarddog.com/terms-changes/?p=33
NOTE: The ‘predatory’ monikor still remains until someone at Prime Partners actually verifies that this term is not retroactive.