If you like to live dangerously. Amtrak has twice shut off redemption opportunities with ZERO notice. Parking points there in 2007 hoping to redeem them in 2008 is possible, but risky.
This is very true, however one thing to keep in mind is that Choice Hotels is a new partner, with AGR anything is possible but i doubt they will cancel the choice hotels partnership in less than three months.
None the less it is important to note that this (and any other offer) is subject to change at any point in time.