I agree that this change will probably lead to economy problems. It may (or may not) work for now that we have lots of boosters opened but after the reset and launch there will probably be issues with card supply. You can't have whales in this game (which I am fine with) who open enormous amounts of boosters and so supply the market.
I think that 1 booster/30 minutes of gameplay is probably a bit much but instead of totally removing the daily booster, I'd rather have a system where you can afford 1 booster after ~1 hour of play and then additional tiered rewards, similar to the current achievements track but resetting each week. e.g. after your first booster for the day you need to play 5/10/15 (adjust numbers as you like) matches for another booster or bigger RP rewards. The current system with boosted rp gain and reserves only adds unneeded complexity imho and would therefore be bad for high active player count after release.
So to sum up: Make one booster/large amout of RP achievable by ~1 hour of gameplay and then add more daily rewards with diminishing returns for those who want to grind
PrincessKenny liked a post in a topic by Amorphium in Recent BFP Reward Changes are Bad for Daily Players