Lets hope, but one method to increase the value of the cards was to burn them, which will be less attractive in future. Furthermore packs contain the same amount of cards (and there will be even more packs than there were beta packs), but at the same time you need less cards to reach the max level of a common card ...

So it all depends on getting more players into the game, who need the big amount of new cards, and on attractive prices, so that it is worth to do everything for winning tournaments or being on top of the ranking list.