There is another possibility with the card expansion, one which may be too dark to contemplate.
What if the packs... are RANDOM BOOSTER PACKS??
Rather than try to figure out which cards are or someday will be "essential", FFG could just throw in a spread of 12 or so neutral upgrades from across all their previous expansions. They could also just update the variety as new cards are released. Maybe even throw in one or two of those campaign exclusive aces/objectives for people (like me) who didn't want to buy a whole box just for some aces. Maybe slide in a couple cards exclusively in the packs to really tempt people.
Eh, probably not.
Edited by Pikeman84