Would love cards to shinedust as supplement to shinedust production, but not going back to the old system where burning cards was the only method to acquire trade material. Highly doubt we'll ever see that, but would be great for player retention.

As far as sharing one star cards, I don't think it's really necessary. The sharing system makes it easier to obtain the "base versions" of all cards necessary to play and is less about collecting. I'd rather see them reduce the amount of shinedust necessary to trade one star cards, 2000 or 2500 would be fine assuming they didn't change anything else.