The game is designed in a way, that encourages frequent chest openings.
All those people, who are playing the game like intended are kinda screwed, cause they had no keys left to open chests for the new blueprints. Yes, they could just farm more of them, but that is beside the point.
What about some sort of a catchup mechanic, that grants, for example, one random blueprint for every, lets say, 20 opened chests - of course a blueprint out of that specific chest. Lets say i have opened a total of 2000 T14 chests, that would mean i unlocked 100 blueprints from the T14 chest.
That would at least not undermine all the players, who are opening their chests in an instant AND would benefit the players more, that spent a lot of time in the game but also all players, depending of their all time opened chests.
So a win-win situation for all of us.