I have no problem with the cards soul bound for the next year or two. Reward sets should be smaller and not flood the market with cards. There is less incentive to buy packs or cards from the market if cards are too east to obtain.
With that said the proposed unlock prices are crazy and make no sense as it will be more expensive to buy your own rewards back from the game than it will be to buy cards from the market. It should be about 10% of the proposed unlock costs and i am happy to take soulbound cards and pay a reasonable fee to unlock.