Whatever value you think there is for you getting $2 packs to flip, the same value will remain at $5 or $10 packs, if not more, because the market will not nosedive/freefall like it will with $2 packs.
A gradual release is not the answer, as you are just begging for thousands of players to get upset and unmotivated which will come with plenty of negative attention and stories....and demand and momentum will be lossed.
We are in beast mode, we should not be making anything more complicated then it should be.
Every single player that owns assets loses if $2 packs come out, and a few people chasing a few thousand dollars in pack markups will lose a few million dollars in their collection values.
Packs will be purchaseable ... people will resale even in the case of Gradual limited $2 packs. The market will raise it to a competitive value probably related to what those cards are valued at for someone who wants to use them in the rental market instead.
Also @yabapmatt and @aggroed have both said they prefer $2 packs... so gradual release is the solution to help not destroy the market. If they decide to go up from $2 that's fine... but I think they can do $2 and let the market decide the value of the cards and leave the difference on the table for their players... that will motivate them to do whatever is needed to get those $2 packs. Play... Stake SPS... get higher in leagues. Talk about a great motivation.