I think this is a pretty good idea.
Make last years packs available at a discount, and on a much faster rotation (if on a rotation at all), let newer players catch up more easily. Reducing the paywall for year+ old content would be nice.
While they're at it, get rid of the whole 3* separate or combined pack thing and just offer the 2* single or double deal on new stuff simultaneously? Why only offer the bulk discount to people who have the old pack?