Will the new cards flood the market prices of reward cards to sub floor levels we have never seen before? Most likely.
Not at first at least, as they new prints become available there will be a rush of demand for little supply. But as the 8mil or so cards start to circulate, the new prints will inundate the market in a matter of months. Hopefully you have picked up a few dice, untamed and gold foils in the meantime; the market will shift dramatically to the cards with limited supply and intrinsic value.
If you can find a card that is functional, and practical; I am certain you will find the card value to increase significantly over the next year of progress.
The devs will continue to goad more players in with new packs, cards, and expansions; creating a perfect world of exploration for new players.