↑この日本語で書いてあるサイトは、素人が書いたものなので、正確な情報は、きちんと本家本元のサイトで確かめたほうがいいですよ。
http://www.translink.ca/en/Fares-and-Passes/Compass-Card/FAQs.aspx
これによれば、移行期間は使えるということですが、その移行期間が終了するのはいつかは決まっていないようです。いつ使えなくなるかは、決まり次第広くアナウンスします、と書かれています。下記の情報によればコンパスカードは来年の春か夏くらいに浸透する予定みたいなので、それ以前の1月にフェアセーバーが使えなくなるということはあり得ないと思います。
Q: I use FareSaver paper tickets. Can I continue to use them?
A: Yes, for a limited time.
After a review of discounts in our tariff, TransLink's Board approved changes that will affect some customers. As part of the changes, several programs will be discontinued, including FareSavers.
FareSaver tickets will stop being sold as Compass becomes widely available for customers in spring/summer 2014. You'll still be able to get a discount on regular fares with the Stored Value option on Compass Cards. If you have leftover FareSavers, you'll be able to use them for a limited time during the transition from the old fare media to the new automated fare collection system. We'll make sure to broadly advise the timing around the discontinuation of FareSavers and their use as valid Proof of Payment so customers can best manage the transition. This will be done with the rollout of Compass.