All games in the gaming store will be purchased exclusively using Gamecredits. More excitingly, most games will be less expensive to purchase inside the Gamecredits store than virtually anywhere else in the world, due to partnerships the Gamecredits community has developed.
That will push the price downwards even further. Because only people will pay for games with Gamecredits that already own the coins. The shop or the platform will certainly sell the Gamecredits immediately for fiat money. Why would anyone without Gamecredits yet make the complicated detour of first buying Gamecredits to buy a game if one could do much more easily with fiat directly?