not impossible. unlikely maybe even today, but not impossible.
if you can only fill theaters 1/3 full (or however they do) and only have a few, tickets may be hard to get/sold out for long long periods of time. plus it may take that long (assuming boots dont cut in too deep) to contractually gross what they need.
Oh, I know exactly the math they're working. It's not a coincidence a bunch of Nolan films (basically everything from TDK to Dunkirk) got re-released here after reopening (Europe). WB has been tracking theater growth and audiences since day one, they are expecting a bigger theater expansion in the rest of the world starting September which means they want to use the last week of August to generate hype since it's almost a limited release.
Two things though:
Multiple European countries have been seeing growth in Corona cases again, with some countries reestablishing part of their lifted restrictions, so reopening and expansion might not go as fast as they might think.
If theaters are going to get closer to an acceptable capacity, other studios are gonna ramp up. Disney has multiple films on their shelf ready to go and I can see them buying up all the IMAX, Dolby 3D and 4DX screens like they did for Star Wars.