Be aware that all points expire 7 years after you get them regardless of account activity. AP started this practice about 5 years ago so there will be a huge demand for seats next year and in 2013 as people who've been accumulating points for a "dream vacation" begin to see that dream turn into a nightmare. You should have gotten an e-mail about this in the past month or so (at least if you're in the tsunami of expiring points.) You may become a victim of that tsunami regardless.
This information does concern me. I recall getting a notice about keeping one's account active, however I do not recall getting any notice, email, letter, advising that all points will expire at some time.
So it seems that if the administrating agency is minimizing access to redeem points for flights, and also expiring those points at an arbitrary date, they are in fact breaching their contract responsibility.
A similar event occurred here in BC last year when BC Ferries tried to rule that advance purchased tickets that were not used could not be redeemed or credited to the consumer's account. BC Ferries backed down and so should Air Canada and AP.
There is a breach of contract here I think since individuals who originally accumulated points several years ago were not advised to redeem them within a specified time frame and the originator changed the contractual rules without consultation.
This should be lawsuit territory.
Then again, much smarter people than I have no doubt reviewed this. Sorry for the rant.