It seemed to me that AH activity increased quite well after the first collection missions came, and by now the prices have settled down too. Something similar will likely happen with newer missions.
There are thousands of other cards to find and use too
Plus it still happens that people not-in-the-know list things cheaper. Packs are better ‘value’ now.
I’d find it more boring if the AH didn’t have these ‘changing’ events and stayed the same the whole year.