This. Stockpiling cards just to purchase a cobalt (what most people desire) is just boring. It takes too long this way. Being able to progress from card-to-card was great. Also, Silver and Gold cards (Bronze too I believe) are worth less and pointless to trade up when compared to the old system. The new system works if you have a thousands of lead cards (which I doubt many people have THAT many cards). The old system was just much better and it sucks that they haven’t reverted back to the old system or modified this one to make it better. Instead we got that crafting week, which helped very little. 
I haven’t used the system since the change, except for the crafting week. I just keep hoping for a change. I’ve been stockpiling credits and cards. I’d love to at least trade up and have a bunch of silvers and golds.
A simple fix to the system would be to just change the prices to the old system, but keep the setup with this one.
Anyways, more on topic: I’d like to see some other things worth spending credits on as well. I would love to see more skin variety, or better looking skins. The obsidian skins are great! Player-made skins and player-made maps contests might help the game out a bit.